set up assistant still appearing after update to Catalina 10.15.2

In addition to the other excellent comments already provided you, you may need to use commands in the Terminal app to resolve this.

Every time macOS boots, it checks for the existence of a file known as .AppleSetupDone. This empty file is created after the completion of Setup Assistant. It doesn't exist on a brand-new, out-of-the-box Mac, nor on one that has had a clean installation of macOS.

Here are the step-by-step instructions. You may want to print them out as you will not be able to access them during the process:

1. Boot into single-user mode by holding down Command-S on the keyboard during startup.
2. At the command-line prompt, type mount -uw /
3. rm -R /Library/Preferences
4. rm -R /Users/YOURUSERNAME/ <-- replace YOURUSERNAME with whatever your user name is
5. cd /var/db/dslocal/nodes/Default
6. ls
7. Delete the file that is named after your user account with a .plistextension. For example, for user name "johndoe" you'd type rm johndoe.plist
8. rm /private/var/db/.AppleSetupDone
9. reboot

JmguzmanSV wrote:

After updating my macbook pro 2015 , every time restart my mac still appearing setup assistant .

have reinstalled catalina but still the same problem. Any ideas?

Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379

Try resetting the SMC https://support.apple.com/en-us/HT201295

You can force quit the Mac—hold the power button/touchID for ~10 sec to force a shut down, then simply restart to test.

If no success then Try a SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. If you can login, then reboot as normal.

If still no success

Boot into Recovery (Command R) and from the dropdown menu: Utilities>  Disk Utility> run the First Aid on your Macintosh HD (and the "Macintosh HD-Data" volume as well if Catalina) If errors are found and repaired, run again until no errors reported.

Recovery: https://support.apple.com/en-us/HT204904

This will be a very obvious question. Have you followed the Setup Assistant steps to completion?