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You can add any games to steam by their product key. Usually if you buy from CDKeys or the like they just give you the key, then from within Steam you use the Add Game, input the key and download.
The main downside of buying from a place like CDKeys is there's a chance the key was stolen or cracked, so may be revoked without notice in the future, however the bigger websites like CDkeys and All Key Shop are generally very good at replacing any keys which get revoked. -
£20 on Humble Store
https://www.humblebundle.com/store/grand-theft-auto-v
Personally I stay away from pretty much anything that isn't Steam/Humble or direct from developer.
Please help, I don't really understand computer games.
I have a PS3 with GTA V on which I still play occasionally. But I don't play any other games on it.
I also have a powerful PC, which has Steam on it. So I was going to buy GTA V on Steam and import (which means I could ditch the PS3 and get lose some clutter). But Steam price for GTA V has gone up to £39 when it's £26 on cdkeys.
If I want to import my character from PS3 GTA I have to do it by the 6th March as Rockstar are turning the feature off after that.
Is there any downside to not buying it through Steam? I guess I couldn't use it with a Steam box whereas I could if I bought it on Steam?
Is there anything else I should think about?