UPM was bundled with JIRA and if you would like to update to latest version, you may want to have a look into the update guide: https://confluence.atlassian.com/display/UPM/Updating+the+Universal+Plugin+Manager
Since you had download the jar file, you can place the jar file in your $home-directory/plugins/installed-plugins and restart. The method were specified here: https://confluence.atlassian.com/display/UPM/Updating+the+Universal+Plugin+Manager#UpdatingtheUniversalPluginManager-JIRA
See https://confluence.atlassian.com/display/UPM/Installing+the+Universal+Plugin+Manager
Btw, UPM is embedded in most apps and you should be able to update it directly from the embedded version itself.
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