Clearly there’s something interfering with Dugi Installer, can you please try to add it to the Avast Exclusions list.
- Open Avast and go to Menu > Settings.
- Select General > Exceptions, then click Add exception.
- Click Browse, and browse to the location where DugiGuides_1.5.3.exe is, tick the box next to DugiGuides_1.5.3.exe, then click OK and Add exception.
As for the constant scan and repair issues, 1.5.3 installer fixes this bug.
Lets focus on the present and try to resolve this together.