License?

I just installed win7 x64, upgraded from x32. 2 questions: 1) Opened my old licensed x32 REAPER, was surprised it runs. Is there any advantage to upgrading to x64 version? Pros & cons? 2) My license has disappeared! I remember after I bought it I got email documentation but now I can't find it (searched mails from Reaper and Cockos). I looked thru REAPER folders & files to no avail. What can I do?

Wait I found the license.

I am only running the Windows 7 64-bit OS with REAPER. I've had zero problems. The 32-bit plug-in bridge works great. You might have a little more "room" for plug-ins.