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I put it in and gog said it was invalid
This question / problem has been solved by Pulzarokkitimage
Is your game retail or steam?
If it is steam other people had the same problem and solved it
http://www.gog.com/en/forum/the_witcher/backup_copy_cd_key_not_valid

Just browse the forums there were a lot of topic on redeeming the backup copy.
avatar
Pulzarokkit: Is your game retail or steam?
If it is steam other people had the same problem and solved it
http://www.gog.com/en/forum/the_witcher/backup_copy_cd_key_not_valid

Just browse the forums there were a lot of topic on redeeming the backup copy.
I'll try that, thanks!