I purchased, downloaded and installed my Crysis 2 from EAG using the 'Download Manager'.

Where on my PC can I now find the installation files?

Thanks

C:/Program Files(x86)/Electronic Arts/Crytek/Crysis 2. That is, if you installed it into your C: drive and you have a 64bit OS. To run the game, go into the bin32 folder and double click Crysis2Launcher.