Amnesia: A Machine For Pigs Discussion Topic Part 1

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[...]or that PC specs were too high for it now xD

For a long time, that was indeed the case. The old version of the game was almost impossible to get to work on Windows XP and Windows 7, especially on multi-core PCs. You had to use community patches and all sorts of tricks (like quickly firing up Task Manager after starting the game and assigning only one core to the process) and even then it would crash every few minutes for most people. The GoG versions of games are remastered versions to ensure that they work on newer PCs.