As linked article clearly states, RHEL8 has no full support for all tools.
In installation README file should be a list of needed system libraries.
If all required libraries are in the system and tools still complains, it might happen that some libraries in newer version are not compatible and they has to be downgraded to version from RHEL7.
I am not RH user, so it is hard for me to justify whether repo structure allows to mix different versions of RHEL or not.
It might be much simpler, if you provide details - which tool, error message, etc.