I just tried to install Quickstart locally using PHP 8.4.6, but it resulted in numerous 'deprecated' warnings and the installation failed.

Deprecated: ldap_exop_sync(): Implicitly marking parameter $request_data as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\symfony\polyfill-php83\bootstrap.php on line 43

Deprecated: ldap_exop_sync(): Implicitly marking parameter $controls as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\symfony\polyfill-php83\bootstrap.php on line 43

Deprecated: GuzzleHttp\Promise\queue(): Implicitly marking parameter $assign as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\guzzlehttp\promises\src\functions.php on line 24

Deprecated: GuzzleHttp\Promise\each(): Implicitly marking parameter $onFulfilled as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\guzzlehttp\promises\src\functions.php on line 260

Deprecated: GuzzleHttp\Promise\each(): Implicitly marking parameter $onRejected as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\guzzlehttp\promises\src\functions.php on line 260

Deprecated: GuzzleHttp\Promise\each_limit(): Implicitly marking parameter $onFulfilled as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\guzzlehttp\promises\src\functions.php on line 285

Deprecated: GuzzleHttp\Promise\each_limit(): Implicitly marking parameter $onRejected as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\guzzlehttp\promises\src\functions.php on line 285

Deprecated: GuzzleHttp\Promise\each_limit_all(): Implicitly marking parameter $onFulfilled as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\guzzlehttp\promises\src\functions.php on line 307

Deprecated: voku\helper\UTF8::extract_text(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 1622

Deprecated: voku\helper\UTF8::file_get_contents(): Implicitly marking parameter $offset as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 1842

Deprecated: voku\helper\UTF8::file_get_contents(): Implicitly marking parameter $max_length as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 1842

Deprecated: voku\helper\UTF8::getSupportInfo(): Implicitly marking parameter $key as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 2580

Deprecated: voku\helper\UTF8::html_entity_decode(): Implicitly marking parameter $flags as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 3029

Deprecated: voku\helper\UTF8::lcfirst(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 4301

Deprecated: voku\helper\UTF8::lcwords(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 4365

Deprecated: voku\helper\UTF8::ltrim(): Implicitly marking parameter $chars as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 4444

Deprecated: voku\helper\UTF8::rtrim(): Implicitly marking parameter $chars as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 5625

Deprecated: voku\helper\UTF8::str_camelize(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 5762

Deprecated: voku\helper\UTF8::str_delimit(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 6022

Deprecated: voku\helper\UTF8::str_replace(): Implicitly marking parameter $count as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 7678

Deprecated: voku\helper\UTF8::str_slice(): Implicitly marking parameter $end as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 7913

Deprecated: voku\helper\UTF8::str_titleize(): Implicitly marking parameter $ignore as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 8704

Deprecated: voku\helper\UTF8::str_titleize(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 8704

Deprecated: voku\helper\UTF8::str_titleize(): Implicitly marking parameter $word_define_chars as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 8704

Deprecated: voku\helper\UTF8::str_to_lines(): Implicitly marking parameter $remove_short_values as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 9064

Deprecated: voku\helper\UTF8::str_to_words(): Implicitly marking parameter $remove_short_values as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 9111

Deprecated: voku\helper\UTF8::str_upper_camelize(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 9352

Deprecated: voku\helper\UTF8::strcspn(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 9515

Deprecated: voku\helper\UTF8::strip_tags(): Implicitly marking parameter $allowable_tags as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 9652

Deprecated: voku\helper\UTF8::strspn(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 11118

Deprecated: voku\helper\UTF8::strtocasefold(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 11348

Deprecated: voku\helper\UTF8::strtolower(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 11403

Deprecated: voku\helper\UTF8::strtoupper(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 11483

Deprecated: voku\helper\UTF8::substr(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 11698

Deprecated: voku\helper\UTF8::substr_compare(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 11868

Deprecated: voku\helper\UTF8::substr_count(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 11926

Deprecated: voku\helper\UTF8::substr_count_in_byte(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 12018

Deprecated: voku\helper\UTF8::substr_in_byte(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 12172

Deprecated: voku\helper\UTF8::titlecase(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 12566

Deprecated: voku\helper\UTF8::trim(): Implicitly marking parameter $chars as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 12984

Deprecated: voku\helper\UTF8::ucfirst(): Implicitly marking parameter $lang as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 13030

Deprecated: voku\helper\UTF8::wordwrap_per_line(): Implicitly marking parameter $delimiter as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 13496

Deprecated: voku\helper\UTF8::reduce_string_array(): Implicitly marking parameter $remove_short_values as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\voku\portable-utf8\src\voku\helper\UTF8.php on line 13827

Deprecated: Constant E_STRICT is deprecated in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\symfony\error-handler\ErrorHandler.php on line 58

Deprecated: Constant E_STRICT is deprecated in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\symfony\error-handler\ErrorHandler.php on line 76

Deprecated: TYPO3\PharStreamWrapper\Manager::initialize(): Implicitly marking parameter $resolver as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\Manager.php on line 47

Deprecated: TYPO3\PharStreamWrapper\Manager::initialize(): Implicitly marking parameter $collection as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\Manager.php on line 47

Deprecated: TYPO3\PharStreamWrapper\Manager::__construct(): Implicitly marking parameter $resolver as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\Manager.php on line 93

Deprecated: TYPO3\PharStreamWrapper\Manager::__construct(): Implicitly marking parameter $collection as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\Manager.php on line 93

Deprecated: TYPO3\PharStreamWrapper\Manager::resolve(): Implicitly marking parameter $flags as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\Manager.php on line 118

Deprecated: TYPO3\PharStreamWrapper\Resolver\PharInvocationCollection::collect(): Implicitly marking parameter $flags as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\Resolver\PharInvocationCollection.php on line 42

Deprecated: TYPO3\PharStreamWrapper\Collectable::collect(): Implicitly marking parameter $flags as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\Collectable.php on line 30

Deprecated: TYPO3\PharStreamWrapper\Resolver\PharInvocationResolver::resolve(): Implicitly marking parameter $flags as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\Resolver\PharInvocationResolver.php on line 60

Deprecated: TYPO3\PharStreamWrapper\Resolvable::resolve(): Implicitly marking parameter $flags as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\Resolvable.php on line 24

Deprecated: TYPO3\PharStreamWrapper\PharStreamWrapper::stream_open(): Implicitly marking parameter $opened_path as nullable is deprecated, the explicit nullable type must be used instead in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\typo3\phar-stream-wrapper\src\PharStreamWrapper.php on line 250

Warning: Cannot modify header information - headers already sent by (output started at E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\libraries\vendor\symfony\polyfill-php83\bootstrap.php:43) in E:\Bearsampp-2025.5.6\vhosts\bsvtpl2.local\includes\framework.php on line 32

The installation works under PHP 8.3.20.

Best regards Olli