I don't know about the SVN add-on, but if your issue with moving to Bitbucket is with switchin to Git, then you can use https://marketplace.atlassian.com/plugins/org.tmatesoft.subgit.stash-svn-importer/server/overview to stay on SVN for now while you migrate.
It started as any story starts, on a normal, rainy day. Admin meets App, and her name was Klok2, and like any first relationship we were both trying to make it work but neither one knew what...
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