Sigh... I had to revert to hosting the files on Google Drive, since Google Chrome did not want to download the file anymore. Now this. I will try to find out what the issue is this time.
For anyone that does want to know, here is a
virustotal scan of the installer and a
virustotal scan of the program itself. They are both clean.
*EDIT*
I did some digging. Apparently this screen is displayed based on reputation of the file. So, if more people download it without problems, the screen will go away. I can get a head start if I buy an official certificate to sign my application, but since that will cost me between $295 - $900 a year, that is not going to happen. Even then there is no garantuee the SmartScreen will not appear. So, in short, there is nothing I can do about it.