Server 5.9. They don't tell you that you need server 5.9 for Catalina

Edhawk

Well-known member
Joined
Apr 10, 2018
macOS
10.14.5
Mobo
GA-Z97X-UD5H
CPU
i7-4790K
GPU
Powercolor RX 580
#2
It is unlikely to be released until September when Catalina is ready for general release.

I would recommend restoring one of your Mojave backups and waiting for Catalina to be out of beta testing before you try installing the new OS on your production machine.