I've run across this issue with a few different apps, usually after a Windows version/SP upgrade.  Some apps won't launch or can't be uninstalled because the installer files can't be found.

The error is: The feature you are trying to use is on a network resource that is unavailable. 

The source it's looking for is typically at C:\Program Files (x86)\ManageEngine\UEMS_Agent\swrepository\1\swuploads\swxxxxxx\example.msi

Is there a reason that these installations are becoming damaged and looking for files in the ManageEngine folder that no longer exist?  I would like to prevent this from become a larger issue in the future.  Thank you.