I downloaded the Subversion but not sure how to install it. Any help would be appreciated.
https://marketplace.atlassian.com/plugins/com.atlassian.jira.plugin.ext.subversion
That's the subversion *plugin* that lets Jira read Subversion information.
You need to set up a subversion repository separately
Once you have a subversion repository, then you can install the plugin into Jira and follow the docs to configure it to point to your repository.
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