I'm trying to rebuild a rather dated instance of Jira DC from a backup before trailing an upgrade, but I'm unable to find / install the "Quick Subtasks for Jira" app.
The app was installed on the backup, and for completeness sake would like to have the rebuilt instance in as similar a state to the state of the instance the backup was taken on, wo would like to have this app installed, however it no longer has a page on the Atlassian marketplace, so it's not possible to download the app file any longer.
Any suggestions?