Have you tried doing a 'Restart' as sometimes this completes the installation?
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see also the thread "stuck on update is being installed" under "General discussion" for potential workaround.
There are several other threads of the same problem. Hopefully there will be a fix soon. It has been going on for months.
Also the New installer is slated to release any day now, the Version/Build 15.1r2. The New User interface should be (Blue) also. As far as my knowledge this build is functioning just fine. I have been running 15.1.156 since last October, and have not experienced anything untoward.
Note: Edited Comment as it was off topic/without any contribution or substance.
Yes, I have restarted the computer several times in the last week. The continual updating still goes on.
If this is Windows 10, turn off Fast Startup as it prevents a clean restart.
Tutorial here: Windows 10 Forums
Or if it's Windows 8 here: Fast Startup - Turn On or Off in Windows 8
Or Windows 7:
Disable through the Control Panel
- Press the Windows key on your keyboard, type in Power Options, and then press Enter.
- From the left-hand menu, select Choose what the power buttons do.
- Under the Shutdown settings section, uncheck the box next to Turn on fast startup (recommended).
- Click the Save changes button.
**Also check that your system clock is accurate for time, day and date.
I have Windows 7