Hello,
FSUIPC operates in two modes:
Unregistered, which is free and acts as a communications channel between FSX and tools outside it. This is all you need for the SuperBug.
Registered, which is not free and a license can be purchased from http://www.simmarket.com, allowing your to have much more control over how FSX works and you interract with it, such as fixing some of the most annoying weather bugs, better control calibration tools and much, much, more besides. You do not need to register FSUIPC to use it with the VRS SuperBug.
If you simply click "cancel" on the registration screen at the end of installation, you will have installed the unregistered version.
For further details, please see the FSUIPC documentation (in your FSX\modules\FSUIPCDocuments folder), which explains all the other things FSUIPC does when registered as well.
Best regards,
Ian P.