Exchange Server 2016/2019 CU Cumulative Update Hangs on Language Setup Step 9 of 18

After waiting two hours for an Exchange cumulative update which was stuck in step 8 or 18 (the language setup), I checked the processes and noticed that the Exchange update task was barely registering any CPU usage (.01% sporadically). I did notice however, that the anti-virus software task had a very high CPU usage rate.

I proceeded to disable the AV software’s live scanner temporarily and sure enough, the Exchange CU task began utilizing 10% CPU and the progress bar started moving along.

The Exchange cumulative update finished shortly thereafter.