It's fine.
I installed the 32 bit version because a recurring crash on save problem seems to be tied to bridged plug-ins in the 64 bit version.
32 bit has been rock steady.
When you install the 32 bit version, you will be prompted to register it, just as you would if you were installing Sonar on a second computer. It is already registered, so you just need to copy/paste the registration code from your account.
You may need to add folders to the vst scan path for third party plug-ins.