Currently using
PBX in a Flash-Purple (Asterisk 1.8/Dahdi with FreePBX 2.9 and the Incredible PBX 2(?) along with FOP2)

Want to upgrade to
PBX in a Flash-Green (Asterisk 11/Dahdi with FreePBX2.10 and incredible PBX (4 or 11 can't remember which works) along with reinstalling my FOP2 once set up

Question:
Steps I need to take BEFORE doing an upgrade (I bought a lifetime license 2 years ago - I plan on paying the yearly maintenance fee BUT do I revoke current license, Rebuild my PBX install FOP2 with the current license (in that order) then apply a yearly maintenance license or or I apply the YML to current install, revoke that and then do a rebuild and reinstall?

Not ready to do this JUST yet but want to know because the last time I didn't revoke the license and had to get it done manually by your (or your "staff" )

Trying to avoid a problem before I create it.

Steps and Process please would be greatly appreciated.

Thank You

PS If it matters I am on Rent PBX with a FQDN and it IS on eth0 (last one I had was venet0:0)