Hi @keidla
Sorry to hear that you got an http 500 error. This error is not related to theme. The theme file is only inside wp-content/themes/
If you have fixed your issues after overwriting files wp-includes and wp-admin then its not related to theme. It’s related to some core file that you have have edited. The theme doesn’t have to do anything with wp-includes and wp-admin file.
Even you can ask anyone about this issues. Please don’t give us a bad rating unknowingly. Please review your rating once again. If you have any issues related to theme then don’t hesitate to contact us via our Ticket Forum