difficulty upgrading latest Catalina 10.15.6
unable to upgrade Mac to Catalina 10.15.6
iMac Pro
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What version are you on now?
Are you running any VPN, Anti-Virus, or Cleaning apps?
If 10.15.x...
Safe Boot, (holding Shift key down at startup).
Try the standalone 10.15.6 in Safe Mode, but not using Firefox...
https://support.apple.com/kb/DL2048?viewlocale=en_US&locale=en_US
10.15.5 to 10.5.6…
https://support.apple.com/kb/DL2047?viewlocale=en_US&locale=en_US
Supplement…