When I login to my recently installed SuiteCRM 8 instance, I get a ton of "Undefined array key" errors in my PHP-FPM log coming from templates. Here is an example from a single login. There are ...

Hello, Version 1.5.x requires PHP 5.4-7.4 as per README.md Downgrade to PHP 7.4 or use the 'master branch' for PHP 8.x.