I actually asked @
Diode if he wants to use my copy for a bit to see how it looks, not forever though cuz I will need it at some point.
in this situation I would make a new directory on the server that wouldn't effect the current directory and use it as a test site, import everything over to see how it looks before committing to the ugprade.
you can import everything over, so don't delete the database until after the upgrade LOL I say that cuz I have made that mistake before.
users would not need to re register if you import everything over right.
I think the only challenge would be importing the accomplishments over, but I could help with that, I did that with RB when I upgraded it from the profile field accomps to dynamic ones.