Please try to run EM as administrator firstly.1. Restart your mac.
2. Run "/Applications/Utilities/Terminal.app".
3. Input the following command then press "Return" key. Don't miss the double quotation marks.
sudo "/Applications/Adobe Extension Manager CC/Adobe Extension Manager CC.app/Contents/MacOS/Adobe Extension Manager CC"
4. Input password of administrative user then press "Return" key.
If it works, you can try to run EM in normal way.
If it doesn't work, please launch "/Applications/Utilities/Disk Utility.app" and repair disk permissions then startup Extension Manager.
Permissions are ok as you can see...
but i see all this virtual HD that i don't have on my desktop...
Anyway now it seems that EM starts normally. This is my terminal after the "sudo" command...
However i'm not able to install any indesign extension. Here in office we must install a thrid part InDesign OPI plug-in.
We install yet this plug-in on 9 mac (same system and same CC versions) without any problems...
Thx for help (and sorry for bad english, i'm italian)
Please run EM as normal user when you install InDesign extension. Also please update EM to the latest version 18.104.22.168.