Catalina 10.15.5 update
I can not update my 2017 MacPro with Catalina 10.15.1 to Catalina 10.15.5...after installing my update is still available. Can you help me?
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Have you tried downloading and then installing the Combo update, click on the link below.
https://support.apple.com/kb/DL2040?viewlocale=en_US&locale=en_US
Connect your mac to your router via cable rather than WiFi.
Once downloaded double-click to install.
Make a full back up before updating.
If you are still having problems try doing this while in Safe Mode.