It clearly says within 2 weeks of purchase...
Valve said:It doesn't matter. Valve will, upon request via help.steampowered.com, issue a refund for any reason, if the request is made within fourteen days of purchase, and the title has been played for less than two hours. There are more details below, but even if you fall outside of the refund rules weve described, you can ask for a refund anyway and well take a look.
Then why would it say that?
They released a client update earlier today. You may need that to enable the refund option.
That's probably why. Thanks.
Edit 1: Just booted up my PC. I'm going to try to get a refund for the games that wouldn't work which is like 4. Hopefully they don't think I'm trying to abuse the system.
Edit 2: only one game allows me to ask for refund and that's besiege. Oh well.