Yeah, seems to be the case here too. If you find a solution please do tell 😃

We have the same Problem. ServiceNow Support confirms this is a "Bug" caused from Zurich patch5. They are applying a Workaround on our instance. After that the Application manager should work again. 

Hi @EntstMar 

Did the issue get sorted form ServiceNow? How did you proceed with the upgrade.

Regards,

Gagan K

Hi @EntstMar 

Did the issue get sorted from ServiceNow? How did you proceed with the upgrade

Regards,

Gagan K

For us, SN support just ran this in background script

new sn_appclient.UpdateChecker().checkAvailableUpdates();

 
I ran it too earlier, don't know why it didn't help until SN ran it. But worth a try for everyone battling with this problem.