We have 17 multi tenant Fusionpbx's installed with about 50 domains on each. I would like to look at the fspbx for some of our customers that want a simpler interface to work with. Problem is fspbx from their script wants php8.1 and I cannot get that to load. Have tried installing the various scripts suggested but to no avail. Tried on both debian 12 and 13. Any hints would be appreciated