I use Avast Free, but I assume Premier has a repair option, so try repairing the installation. Open Control Panel > Programs > highlight Avast > click Change, select Repair option from menu. After repair, see if SFC produces the same error.
Not knowing how critical that file is for avast, it might not be an issue to your configuration. But. . . I have those same files on win7 and win10 in C:\windows\winsxs and got no error running sfc. The error seems to indicate sfc can’t find the manifest file it wants (maybe to correct the problem?) Perhaps one of the Evangelist experts can shed some more light. You would think that a repair would replace them if they were significant or deemed corrupt by avast. Maybe a clean install could make sfc happy.
Yes everything is working fine.But last week the SFC reported no problems. I guess I’m a perfectionist.However an expert should be able to decipher a CBS log and tell me the solution.But you’re right that nothings perfect and I should be content.