The product versions supported by an add-on are listed just below the add-on name in its Marketplace entry, and more details about the version history are available via the Versions tab.
The Protect Branch Delete add-on is marked as compatible with Bitbucket Server (Formerly Stash) versions 2.12.1-3.11.6 and also supports 3.8 accordingly (refer to its Versions for details, though in this case there is only one release apparently).
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