The root of the error message is change implemented in the Mac Security features. Please see the following article for more information on that change:
In order to be able to complete Blaze client installation, please follow the steps below:
Navigate to the Gatekeeper application: Apple menu > System Preferences… > Security & Privacy > General tab. Once there, select “Anywhere” under “Allow applications downloaded from:” You can set this back to default after you have completed the download and installation of Ericom Blaze.
(Default Mac Setting pictured below- Please change to “Anywhere”)