MacOS is believed to be one of the best-operating systems made for computer devices.
The reason is that this OS outperforms in any case and has very few related issues.
It might be any of these could fix up the issue quickly!

To refresh the installation, just follow the below steps:
1.
First,ld down the power button of your Mac machine and then hold it for about 30 seconds.
This would switch off your Mac but dont worry, Your Update wont be distracted or disturbed anyway.

The Update should then automatically get resumed.
To solve the frozen screen issue, we have to reset that NVRAM.
To do that, you better follow up the below steps:
1.

Shut down your Mac and then again power it On.
Immediately after the startup sounds on your Mac, press and holds the Command+Option+P+R key combinations.
Keep saving those keys until you hear the startup sounds again on your Mac.

Release the keys, and your NVRAM should be reset.
The Update would also start or get resume now easily without any issues.
To do that some steps have to be followed, and these steps are given below:
1.

This would take you to the recovery mode of your Mac.
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