You need to use chairloader. What platform are you on btw? The current public version doesn't support GOG unfortunately. That's already fixed behind the scenes but they're not releasing a hotfix for whatever reason AFAIK.
You use the mod manager to install a chairloader (zip) mod, go to your downloads folder, select it, and deploy. It should be pretty intuitive
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You use the mod manager to install a chairloader (zip) mod, go to your downloads folder, select it, and deploy. It should be pretty intuitive