I'll answer best I can, but these forums are more User -> User vs Company -> User.
1. You'll need to upgrade the forum to UBB.Threads 6.5.5 then import that data into UBB.Threads 7.x (as to not loose any data).
2. I believe you just need to renew your license, this is a $125 fee (as seen on the
purchase page)
3. I believe that Groupee offers upgrade services, or you could hire someone well versed in the UBB (such as myself or Allen Ayres to preform the upgrade for you; fees would vary from place to place/version to version as in this case it'd be 2 upgrades to get you all current and I'm not sure who charges what).