To reband the PRO-96 you will need a USB-serial cable (the RS one as shown in our wiki, or the GRE equivalent if you can find it), and either Win96 or ARC96. There are 2 articles in our wiki that show you how to do it manually
Connecting scanners via USB - The RadioReference Wiki
ARC96 - The RadioReference Wiki
and the bottom of...
Win96 - The RadioReference Wiki
although to be honest, if you're using the MPSCS, since it's a P25 system, the database flag wasn't set - you may need to use the above instructions manually. I'm sure someone in the Michigan forum can help steer you straight there.
But there's a simpler solution. Since you are a premium subscriber if you were to download data from the databases, you will find that either app will set the tables up for you.
If you want to get the latest firmware/DSP (which has nothing to do with rebanding, unlike the Uniden scanners), see the fourth topic of
PRO-96 FAQ - The RadioReference Wiki
Mike
[edit] Looks like someone beat me to it...too slow, I guess.