server connection failed (no replies)

I installed my workbench 8.0.22 for my mac Catalina. It installed successfully but only the server DB is not connected. I can't use it because I can't connect the Server DB. I tried to checked the system preferences. But it asking the New Server Upgrade. But unfortunately I can't use high version of workbench because my OS is only MAC Catalina.

So please give me some advised.