This shouldn't happen as I have Mac Installed on my Mac and it's working without errors. However, if you have an older version of the software, then problems might appear because of compatibility. I strongly recommend you install the latest version that's available for downloading from its official page.
If you can't use the official page, access the direct download URL that's available for users: http://files.informer.com/simac.dmg
I also recommend you uninstall the current version from your computer. Additionally, go to Settings and turn off the Firewall or add Mac Informer to the exclusion list.