I'm not 100% sure on upgrading from 6.2 (wow) but I do know that you'll need to get to v6.5 to do the upgrade and the standard upgrade path to v7 is:
From UBB.Threads v6 would be
  • Upgrade to 6.5.5 (as the importer will only work with 6.5.x)
  • Import to 7.2 (as there have been some bugs in the past with the permission matrix change in 7.3)
  • Upgrade to 7.5.8


From UBB.Threads v6:
  • Upgrade to 6.7 (as the importer will only work with 6.7)
  • Import to 7.2 (as there have been some bugs in the past with the permission matrix change in 7.3)
  • Upgrade to 7.5.8


The only version of UBB.Threads that'll run on the newer builds of PHP is v7.5.8

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
Do you need Forum Install or Upgrade Services?
Forums: A Gardeners Forum, Scouters World
UBB.threads: UBBWiki, UBB Styles, UBB.Sitemaps
Longtime Supporter & Resident Post-A-Holic
VNC Web Services: Code Modifications, Upgrades, Styling, Coding Services, Disaster Recovery, and more!