You can try downloading the newest version
Windows:
Mac:
or
to force the session to open in the browser instead of the addin:
add
?launcher=false
to the end of the URL
example:
https://meeting.sinc.stonybrook.edu/sinc?launcher=false
I tested this out this morning from the Adobe Connect Diagnostic Test here:
https://arcps.adobeconnect.com/common/help/en/support/meeting_test.htm
After the test, it provides you with an install plugin button. My first time downloading the plug in, I got a strange message that I didn’t have enough harddisk space:
https://www.screencast.com/t/lNdxmMYTV
I restarted and then everything worked out fine.
Since I run a lot of webinars, I am going to ask all my participants to please check their connection and update the plugin from this URL:
https://arcps.adobeconnect.com/common/help/en/support/meeting_test.htm
Note: Anyone who is not an administrator on their machine may need to contact support to install the program.