Theme Update Failing – PHP 7.4.33 and Enfold 4.02

I’ve used Enfold for years but neglected updates on one site in particular. I’ve purchased a new version of Enfold, updated my support subscription, and have tried the processes for upgrading an older theme (this site is still on 4.0.2) as outlined in multiple posts in this forum without success.
My partner does the server upgrades and pointed out to me that this site is stuck on an outdated version of PHP (7.4.33). When he updated to 8.3 the site started failing on some but not all tasks. He suggested first updating the theme version so he rolled PHP back, but the update steps don’t work either. I’m on a very old version of Enfold. I created a new token and added it, hoping the automatic updates would work, but that isn’t working either.