Issue title: Avast treats latest online installer as virus.
 Issue body: Damned antivirus.
![avast_fail2](https://user-images.githubusercontent.com/7596025/29878061-2e1c1444-8daa-11e7-898a-93f5e68adc66.png)

 Comments: 
 Comment 0: Just download it ten times on different devices to stop this crap (suggestion I have got from official long times ago to stop DRep alert).
DRep is paranoia for any "unknown files"
 Comment 1: Where can I get 10 different devices to download into? Or just it goes away after 10 download fails?
 Comment 2: I think, we can just ask at least ten of community people who has Avast to download those files
 Comment 3: Okay, I made experimental InnoSetup-based installer http://wohlsoft.ru/docs/_laboratory/installers/pge-online-installer-innosetup.exe which you can try out. Now it has self-update checking. So, if I need to update installer itself, I will only change a version number on the server side
 Comment 4: Avast blocks InnoSetup-based installer. DRep
 Comment 5: As for now, old NSIS installer no longer treatead as virus...
{'source': 'GithubIssues', 'repo_name_with_owner': 'WohlSoft/PGE-Project', 'issue_id': 254024397, 'repo_stars': 161.0}