Avast Internet Security (AIS) doesn't include the Avast Cleanup Premium (a paid service) isn't included in AIS.
You have the free version of Cleanup which only reports, to fix the issues you have to have the paid version.
There are other taster elements of Avast paid products that aren't included in the AIS installation, if you did a default (not custom) install and ran a Smart Scan all of these would be run in the scan.