Install
This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.
Install straight from GitHub with WP-CLI:
wp plugin install https://github.com/johnpbloch/discount-jetpack/archive/refs/heads/master.zipNo built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.
Remove the annoying 'new module' count from the Jetpack menu in WordPress.
I use Jetpack for a limited number of modules and hate seeing the "Update" counters in the menu for modules I'm aware of and chose never to activate. So I made a very basic plugin that fixes the issue.
Before

After

License
Discount Jetpack is licensed under the GPLv2 or later.