Hello,
DomainRep is a feature of Avast which blocks PE (.exe, .dll, ...) files downloads if all of these conditions are met:
1. The file is not prevalent enough, ie. not enough Avast users launched the file yet,
2. The domain is not prevalent enough, ie. not enough Avast users downloaded (any) PE files from the domain yet,
3. The file is not signed or Avast does not trust the signature.
Once one of these conditions is no longer valid, Avast will stop flagging the download.
Milos