geoconker: The code does expire pretty soon, but after you use it to redeem a game then the game is yours forever.
Abcde00: redeem from email right? so what were the temporary ones from from the list created by Adamantios.. which games expired?? or if i understand correct after redeeming you owned it.. so what was Azrael360 refering to? if you have the code in email and dont redeem it for a period of time. and by the way how do you get your games code from your own list for giveaways? thx. sry for many questions
If you buy games and select the "gift" option, you'll get a code on your email. These are permanent, as far as I know.
The thing is, the temporary giveaways hosted by GOG always seem to give codes with a time limit to redeem them, so if you don't redeem them before the expire date they'll simply not work anymore. Azrael360 was just pointing out this fact - these games (AvP and Torchlight) were given away quite some time ago, so the codes you could use to redeem them for free probably aren't valid anymore. But who knows, maybe these giveaways had codes with long expire dates, never hurts to ask like you did.
In order to redeem GOG games, you just have to paste their code in this page:
https://www.gog.com/redeem