I got an error again

Good catch DarkSynopsis! I totally missed that in the screenshots.

"Program Files" and "Program Files (x86)" folders are both heavily protected folders by Windows. Exactly as DarkSynopsis posted you should re-install the game in another folder.

Perhaps create a folder like the following and re-install the game into it:

C:\GOG

C:\Games

Both.

The problem is that Windows protects those two folders and apps like Last Resort Launcher can't modify files in those folders.

Sorry for the hassle but I blame Microsoft