<t> I have been unable to install Empire in Arms with the original installer or the troubleshooting installer. It appears to fully install showing 100% installed but just says "Please Wait" and hangs forever at that point. Disconnecting USB devices while the install was going on made no difference ...

After I've downloaded the patch and try to install it, I get the invalid serial number error every time.

No, I'm still having the same problem.&nbsp; The game installs fine with the original serial number from Matrix.&nbsp; When I try to install the patch, however, I get an error message saying the serial number was invalid.

Jim Sottile

<t> I am having the same problem. I recently reinstalled the retail version on a new computer. Install went fine with the serial number provided. When I tried to register, I got an invalid id message and when I tried to install the latest patch I was told the serial number was invalid. What can I do ...