I'm in the same boat on a MAC, tried to follow all the instructions.  I am a longtime ISY user. Everything was working 2 months ago, just wanted to update some times and have spent the last two night trying to "Find ISY."  Now the UD icon is gone off my desktop and when I click on start.jnlp it get the screenshot shown below, can't verify developer.  Any help is greatly appreciated.

Open System Preferences, and click on the Security and Privacy icon, General tab.  You should be able to allow 'start.jnlp' from there.

Thank you for the suggestion, it does not allow me to specify.

@ronlovetri, you have to go to the Security & Privacy icon within an hour after you tried to open the app by the unidentified developer.  Have a look at this link: https://support.apple.com/guide/mac-help/open-a-mac-app-from-an-unidentified-developer-mh40616/mac

 

Thank you!!  It worked as described.  Really appreciate the support, it would have spent endless hours trying to get this to launch.  Thx, Ron

On 6/30/2022 at 9:30 AM, ronlovetri said:

It worked as described.

Glad that @Bumbershoot was able to provide the help. It seems that's similar to the directions in the ISY Wiki for MAC users found here - https://wiki.universal-devices.com/index.php?title=Main_Page#MAC_Users

 

 

EDIT: Moved from prior location as was new issue.

Was attached to this post: https://forum.universal-devices.com/topic/37031-after-so-many-years-still-cant-connect-to-isy/