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I had to play on a different computer for a few days and now, after copying my save to my usual computer, all the challenges that I had found are all gone and I have to find them again. So obviously they aren't saved in the game's save folder, does anyone know where they are ?
The data for the secret challenges is stored online. That's why the GOG version does not have these challenges.

To do them you must download the game version from the developers homepage using your key found on your GOG download page. Install and activate the game using your key. Activate online challenges in the game's config.

Have fun.
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charbon: I had to play on a different computer for a few days and now, after copying my save to my usual computer, all the challenges that I had found are all gone and I have to find them again. So obviously they aren't saved in the game's save folder, does anyone know where they are ?
While the web version is online, the gog version is completely offline. If you are using the gog version, search for a file called "retos.bin". It should be in the "appdata/roming/unepic" folder and paste it in the analog folder in the new computer.
If you are however using the web version, just follow Geralt_of_Rivia's instructions.