!!! info "Sonarr is a PVR for Usenet and BitTorrent users. It can monitor multiple RSS feeds for new episodes of your favorite shows and will grab, sort and rename them. It can also be configured to automatically upgrade the quality of files already downloaded when a better quality format becomes available."
For Installation and Quick Start Guide please check the official [WikiArr](https://wiki.servarr.com/en/sonarr){:target="_blank" rel="noopener noreferrer"}
(Default/Stable): This has been tested by users on nightly (`develop`) branch and it's not known to have any major issues. This branch should be used by the majority of users. On GitHub, this is the `main` branch.
(Alpha/Unstable) : This is the bleeding edge for Sonarr v4 Beta. It is released as soon as code is committed and passes all automated tests. This build may have not been used by us or other users yet. There is no guarantee that it will even run in some cases. This branch is only recommended for advanced users. Issues and self investigation are expected in this branch. On GitHub, this is the develop branch.
!!! danger "**Warning: You are not able to go back to (v3) `main` or (v3) `develop` after switching to the v4 branch without reinstalling and locating a v3 backup.** On GitHub, this is the `develop` branch."
