My antivirus has also blocked it as well.
I just want to know, If its a secure software than why antivirus blocking it to connect online ?
Generally, the "default" setting for a lot of software firewalls is "block everything" unless it's a super popular mainstream app like Outlook or Chrome etc. And some even block those apps as well.
It isn't that the app is "dodgy" or "suspect"... It's just that the firewall isn't configured properly and/or it doesn't recognise the app. You can't expect antivirus app developers to know of every single app ever made!
Honestly, firewalls implemented by antivirus apps are probably the worst...