Microsoft is blocking Windows 10 updates for some Avast and AVG Antivirus users
If you're looking to install either Windows 10 1903 or Windows 10 1909 (the May 2019 and the November 2019 updates) and you're a user of Avast or AVG Antivirus, you may well find that Microsoft prevents you from updating.
The company has identified a compatibility issue with the antivirus software and is therefore blocking the updates. Microsoft is also advising users not to try to sidestep the block by manually installing the update.
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In an update to the documentation detailing known issues with Windows 10, Microsoft explains: "Microsoft and Avast has identified compatibility issues with some versions of Avast Antivirus and AVG Antivirus. Any application from Avast or AVG that contains Antivirus version 19.5.4444.567 or earlier is affected".
The company goes on to explain that updates to Windows 10 1903 and Windows 10 1909 for anyone with the problematic software installed.
We recommend that you do not attempt to manually update using the Update now button or the Media Creation Tool until a new version of your Avast or AVG application has been installed and the Windows 10, version 1903 or Windows 10, version 1909 feature update has been automatically offered to you.