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Thanks for this post. I had the same problem of the updated stalling when nearly done with the "Extracting" step forever. Repeatedly downloading, restarting the Mac didn't help.  

Then I turned off Avast Core Shields for File and Web (see below), and again downloaded the update. After the download completed, "Extracting" stalled for maybe 30 seconds but then completed. After that I turned Avast Core Shields back on. 

Avast Security v 15.2