Good morning, I noticed that on several devices where I have AVAST FREE installed the virus scan report is not working, I do not know if this report was blocked in the version or is a BUG same.
Check the settings for creating a log file.
If they are set correct and the log file isn’t created, perform a repair of avast and check if the problem is solved.
Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed
https://www.avast.com/faq.php?article=AVKB204
If Repair doesn’t fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf