Messes a lot with PHP code

I usually migrate WP sites by hand. This time a graphical designer used All-In-One-Migration. I later found the plugin messes up the installation and you cannot remove it without running into several problems (mostly connected to ssh redirects). Author is not helpful, as I found in the support threads.
I never had such issues when migrating by hand.
So, if you don’t know what you’re doing you might use this plugin – in case it works you’re lucky. In case it does not work as intended, go back to your last backup and ask someone who is capable…