Those with Dev Alpha C devices now get to download the same OS 10.1.0.1483 version that Q10 users are currently running on their phones. It's just a small bump up from the previous OS leak, but there is bound to be some improvements. Be sure to let us know how the OS works for you in the comments below!
1. Turn device off
2. Open OS .exe Autoloader file and wait till says "connecting to bootrom"
3. Plug device into computer and turn on
4. Device will begin to update and green LED may appear
5. Wait till device is finished updated and restarts before disconnecting
Warning: Please remember that this IS NOT an official operating system release. If you wish to install this OS keep in mind that this may cause your phone to not function properly. Also remember, upon loading this OS, it will wipe your device clean. Make sure you back up your device before loading it. Otherwise, you will lose all your data.
Source: CB Forums