Wow, you're really trying your best to make it as complicated as possible aren't you? ;-)
If you don't ALSO want any of the older versions installed just forget about them now and install PBP3, done.
It's called an upgrade only because you've already payed for an older version - what's on the actual DISC is exactly what you'd get if you bought it "new". I know this isn't always the case with other software but with PBP3 it is, in my experience.
Once installed run the licence manager to activate your license. If I'm not mistaken you can have your licence active on two machines at once. If you need to change machine run the licence manager and de-activate the licence on the machine you're getting rid of in order to free it up.
/Henrik.
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