My goal is to download Sonar for Bamboo, but when I click on the Free Trial Button, it says that there is a problem accessing the file Sonar for Bamboo. 
When I tried to download the app and upload it myself, the page was stuck on the installing screen and did not install no matter how long I waited.

I then thought to update my troubleshooting and support tools, but there was a problem accessing that file as well.

This made me think that the problem is not with the specific Sonar app, but with my UPM.
Please help!