Clearly there’s something interfering with Dugi Installer, can you please try to add it to the Avast Exclusions list.
    1. Open Avast and go to Menu > Settings.
    2. Select General > Exceptions, then click Add exception.
    3. 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.