Where to Download
Changes
Below are the major changes of the released versions and links to more detailed release notes.
Alpha
This is the second alpha of the 0.4.9.x series which has a series of major and minor bugfixes.
It also includes a new major feature called happy families, which significantly reduces the size of our network documents and eases the process of configuring multiple relays for a single operator.
If you’re a relay operator upgrading to this version, please set up the Happy Families feature to help us test it out! 
See this guide for instructions: Tor Project | Learn how to configure your relays' FamilyID
Many thanks to all!