If you are developing a Bitbucket Server add-on, simply set your add-on's dependencies to the version of Bitbucket Server you want to develop against. For example:
<bitbucket.version>4.4.1</bitbucket.version>
<bitbucket.data.version>4.4.1</bitbucket.data.version>
If you just want to run an older version in your production environment, Atlassian keeps a download archive of previous versions here: https://www.atlassian.com/software/bitbucket/download-archives
If you want the source code of an older version, go to your Atlassian license management page (https://my.atlassian.com/), click on your Bitbucket Server license, and click on the "Download Source Code" link.
p.s. I invite you to try out my Commit Graph And More add-on. It's the best commit graph add-on for Bitbucket Server. Dramatically improves your team's ability to see exactly what's happening in your Git repositories. Don't forget to enable the included Protect-First-Parent hook to prevent foxtrot merges in master.
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