Universal Plugin Manager seems to be an old version.
Can you click on the 'Plugins' item in the "Plugins" menu? It should lead you to the existing page of plugins, and you should get a message that your "Universal Plugin Manager" has an update. Do the update and you will get the direct menu options.
Do you have access to internet?
If yes, you should find an option somewhere in that page to upload a new plugin (either using a URL or directly from disk) . You can either provide the download link from this URL or download it an provide it from the disk. https://marketplace.atlassian.com/plugins/com.atlassian.upm.atlassian-universal-plugin-manager-plugin
I can't tell you the exact place to click as I have no clue how the old UPM looks, if you add screenshots, it will help.
Or do this. Download the right version for your JIRA version from here https://marketplace.atlassian.com/plugins/com.atlassian.upm.atlassian-universal-plugin-manager-plugin
And place it in jira home/plugins/installed-plugins and restart JIRA
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