Error on PHP 7

I’ve noticed some warnings/errors too. I’m running a checker for PHP7 errors/warnings and have this output upon testing:

FILE: /http/dev.example.com/wp-content/plugins/download-manager/libs/class.Crypt.php
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FOUND 0 ERRORS AND 10 WARNINGS AFFECTING 5 LINES
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 19 | WARNING | Extension 'mcrypt' is deprecated since PHP 7.1 - use openssl (preferred) or pecl/mcrypt once available instead.
 19 | WARNING | Function mcrypt_get_iv_size() is deprecated since PHP 7.1; use OpenSSL instead
 21 | WARNING | Extension 'mcrypt' is deprecated since PHP 7.1 - use openssl (preferred) or pecl/mcrypt once available instead.
 21 | WARNING | Function mcrypt_create_iv() is deprecated since PHP 7.1; use OpenSSL instead
 23 | WARNING | Extension 'mcrypt' is deprecated since PHP 7.1 - use openssl (preferred) or pecl/mcrypt once available instead.
 23 | WARNING | Function mcrypt_encrypt() is deprecated since PHP 7.1; use OpenSSL instead
 43 | WARNING | Extension 'mcrypt' is deprecated since PHP 7.1 - use openssl (preferred) or pecl/mcrypt once available instead.
 43 | WARNING | Function mcrypt_get_iv_size() is deprecated since PHP 7.1; use OpenSSL instead
 53 | WARNING | Extension 'mcrypt' is deprecated since PHP 7.1 - use openssl (preferred) or pecl/mcrypt once available instead.
 53 | WARNING | Function mcrypt_decrypt() is deprecated since PHP 7.1; use OpenSSL instead
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FILE: /http/dev.example.com/wp-content/plugins/download-manager/libs/class.Pagination.php
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FOUND 2 ERRORS AFFECTING 1 LINE
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 136 | ERROR | Extension 'ereg' is deprecated since PHP 5.3 and removed since PHP 7.0 - use pcre instead.
 136 | ERROR | Function eregi() is deprecated since PHP 5.3 and removed since PHP 7.0; use preg_match instead
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@shaon, awesome, thanks for the reply!