Hey, thanks for letting me know. The fact that your browser blocks exe downloads seems to be a fantastic feature from security perspective. Although it seems to get in the way in this case. :/
I had a brief look and I have not found what could cause this. To be able to work on this, I would need the error message. Could you start it from the Powershell. E.g. with .\duesternis.exe and send me the output?
Maybe another download from a different browser/PC might fix it?