Upgrade from 18356.16 to 18362.1 fails

Looks like a lot of these failures are caused by the same plugin (AppxUpgradeMigrationPlugin.dll) and the same process (Gather data, scope: EVERYTHING).

The process that the plugin is responsible to do is flagged as critical. When it fails to migrate just one app, the setup has to abort. I modified the ISO file so the process can be flagged as not critical, so the upgrade just continues even when it fails to migrate some apps.

But as I said in my previous reply, the migration really didn't work and a lot of apps (including the Microsoft Store) are broken after the upgrade (though some apps are fine). So I went through more difficult hoops to try and solve that issue, and now it's fixed.

Upgrading shouldn't be a hassle. Microsoft can only provide the same old troubleshooting steps which just doesn't work. I'm not sure if this is the fault of the plugin included in this upgrade package. The plugin might be unable to migrate some apps due to mess ups from previous upgrades. If you don't want to go through the tedious steps to try and upgrade to 18362.1, the next upgrade might not have the same problem and you could try and wait for it.