I have manually updated UPM which crashed application as it wasn't supported by Confluence version. Now we can't get rid of new version.
Confluence version 5.3
UPM old version was 2.14
UPM updating to 2.22
Here's the version list of the UPM: https://marketplace.atlassian.com/apps/23915/atlassian-universal-plugin-manager/version-history
Just download the version you need from there and install it manually.
Glad you already came up with a solution.
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