There are plenty of free trials of programs you can use to hide your i.p temporarily whilst you install the game. There is a way to release and renew i.p addresses but I don't think it will change your location.
Click:
Start>Run
Type:
cmd - to bring up command line
ipconfig - to view current i.p status
ipconfig/release - to get rid of the current i.p address
ipconfig/renew - to get a new i.p address
As I say, I'm not sure if it will help.