UBB.threads 7.7.5 supports PHP7, nothing currently supports PHP8 outside of beta. PHP5 support is there for later versions for the time being

This is listed on the main page of this site under requirements:
PHP 5.4 or newer
PHP 7.4 recommended
MySQL 5.5 or newer
MariaDB also compatible

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
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!