Hi Is there such a thing as a repair game button as in most games. I know this one is pretty oldish but it would save uninstalling/reinstalling game

Here is the guide:

https://support.gog.com/hc/en-us/articles/360003930017-My-game-data-is-corrupt-How-can-I-repair-my-game-?product=gog

Without acrimony and as a suggestion, you should take a look in Google next time, being a very simple query, so as not to spam the forum. The game has so many problems and there are queries or useful feedback that therefore is hidden.