In Photoshop CC 2014 I had made a panel of html buttons and packed it into a zxp which I distributed to my co-workers. Then it was finally installed with Extension Manager.
But since the Extension Manager is no longer viable with the CC 2015 update, I had to go through the process of privately publishing my zxp to Adobe Exchange, create a group and invite people.
Now when I visit https://creative.adobe.com/addons/my_addons I see it and have the option to "Remove" it. And if I click on All Add-ons or go to Photoshop in the left side menu, it shows up and the same button now says "Install". Pressing install does nothing, and I don't have the extension installed in Photoshop. I can't find any hint or indication as what might be wrong and the documentation just leads me in circles.