The point is that these files aren’t routinely in an avast update (virus definitions) or in a program update as there would be no requirement for the .sum file as the aswVmm.dll would be included in the avast integrity checking function.

These are more normally seen in a user applying a fix/patch, have you done/attempted to do this ?

There is a possibility that this could occur as a result of an avastemergencyupdate, but that should have placed both files in the avast program folder as mine are.

Have you been getting any errors/bsod related to the aswVmm.dll file ?