For me, it works… which are the errors you’re experiencing?
I agree that using a second partition to files, data, documents, etc. is a very good procedure due to reinstall the operational system.
But, I think programs should be managed as the operational system. You must reinstall them and not just using an ‘old’ folder at another partition. Not all the times this will work.
Are you refering to a new, clean, installation of avast, from the scratch?