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How to determine what caused Anniversary Update to fail
I downloaded the Anniversary Update and ran it. It seemed to be doing ok - the % complete got up to 91%, including several restarts, and then I got the frowning face icone with the message "Something went wrong". After that my screen said it was restoring my previous version, which is what I am running now and seems to be OK.
So what now? How is one supposed to figure out what caused the update to fail? I've looked at the upgrader_default.log file but don't see anything helpful in there. There are a couple of error messages with code 0x80070002 but searching that ends up at a MS page that says support for XP has ended.
My boot drive now has a 15.5MB directory called WIndows10Upgrade that has a lot of stuff in it. Is there something in here that's worth running to see what's wrong? Or should I just stick with my current version and wait for the next "upgrade"?