Great work Ehelms and thanks for such a quick response! 
Today I have tried to install Katello 4.0/Foreman2.4 on Centos-7, and 4.0/2.4 and 4.1/2.5 on both Centos-8 and stream, and all combinations seem to be stuck in some kind of dependency hell?
# yum install katello
CentOS Stream 8 - AppStream 17 kB/s | 4.4 kB 00:00
CentOS Stream 8 - BaseOS 21 kB/s | 3.9 kB 00:00
CentOS Stream 8 - Extras 11 kB/s | 3.0 kB 00:00
Error:
Problem: package katello-4.1.0-0.6.rc1.el8.noarch requires candlepin >= 2.0, but none of the providers can be installed
- package candlepin-4.0.2-1.el8.noarch requires tomcatjss >= 7.2.1-7.1, but none of the providers can be installed
- conflicting requests
- package tomcatjss-7.6.1-1.module_el8.5.0+737+ee953a1e.noarch is filtered out by modular filtering
(try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
Why is it that Katello seems to have become so much more difficult to install? I personally would gladly pay any reasonable sum to subscribe to a repo where I could guarantee a clean install whenever I needed it, even if it was not the absolute latest version.