In order to do so, you'll need to navigate to Administration » Plugin and click on 'Uninstall' next to the UPM under 'User Installed'. If you can't uninstall the plugin this way, you'll need to:
Any of these methods will force JIRA to use the bundled version of the UPM. If you wish to install a version released after the bundled but not the latest, you can use the Upload Plugin link on the Universal Plugin Manager to upload any version you wish from here.
I hope this helps!
Without restarting Jira you should be able to directly install an older version from https://marketplace.atlassian.com/plugins/com.atlassian.upm.atlassian-universal-plugin-manager-plugin via the Upload Plugin link.
It has worked for me many times for other plugins, so it should also work with the UPM.
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