Unstable often makes irreversible changes to existing Jellyfin setups. Please make regular backups of Jellyfin files. [Learn how to create backups.](/docs/general/administration/configuration#server-paths)
The weekly unstable builds are generated every Monday 5:00 AM UTC. Testing using the Unstable builds can not only test Jellyfin itself, but also help identify issues with packaging.
To install them, navigate to our [downloads page](/downloads/server) and choose `Server`, choose your platform, then choose `Unstable`. The choices have to be made in this order. After choosing, scroll down and find the installation method you would like to use.
The Master branch of the server can be used to obtain the absolute bleeding edge. This is only intended for developers. Further info can be found [in the packaging repository itself](https://github.com/jellyfin/jellyfin-packaging) and [in the contributing docs](/docs/general/contributing/development).