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It doesn't matter which iso I used a linux iso and mount it then SP works. GOG should fix this. I found this out in the review section. LMAO
IW 2 game only!
Post edited December 25, 2022 by smuggly
You don't have to mount anything. Just have a virtual drive.

There is an article on it in the game's support section of gog. They link you to software which allows you to create said virtual drive. Even empty, it will work.