There are currently compatibility issues with older versions of Avast Antivirus and AVG Antivirus under Windows 10 and Windows Server, version 1903 and higher

Microsoft and Avast has identified compatibility issues with some older versions of Avast Antivirus and AVG Antivirus that might still be installed by a small number of users. Any application from Avast or AVG that contains Antivirus version 19.5.4444.567 or earlier is affected.

To safeguard your upgrade experience, we have applied a hold on devices with affected Avast and AVG Antivirus from being offered or installing Windows 10, version 1903 or Windows 10, version 1909, until the application is updated.

Affected platforms:
Client: Windows 10, version 1909; Windows 10, version 1903
Server: Windows Server, version 1909; Windows Server, version 1903

Known issues and notifications