You can download Patch 1.1 from here:
Crysis 2 Patch 1.1 [Manual Download]
Please inform us via this thread, if this patch worked for you, or if you had any problems.
If you did experience some problems then please assist us by answering as many of the questions below as you can. This will help us to identify the issue and resolve this matter as soon as possible;
1. Have you previously installed the Crysis 2 PC demo?
2. Have you uninstalled the demo before installing Crysis 2 retail?
3. Did you change the path for the default installation and if so, where to?
4. Which Operating System are you using? (Example: Win 7, 64-bit)
5. Where did you purchase the game from – EADM, Steam, Retail or another DD partner?
6. Can you provide the MD5 checksum for the Crysis2.exe in the game directory?
7. Which virus scanner software are you using?
You can post all of this information in this thread as it is being closely monitored by Crytek staff.
You can check what version you've got by right clicking on the Crysis2.exe -> Properties -> Details -> File Version
NB: If you have bought the game from Steam you do not need to manually patch; Steam guarantees that your version is up to date
NB: If you have bought the EADM version, please read the following post: http://www.gamesas.com/forums/viewtopic.php?p=215323#p215323