Btw, UPM is embedded in most apps and you should be able to update it directly from the embedded version itself.
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
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