It has moved to http://github.com/ArduSat/ArdusatSDK
The old Ardusat has a new name: Spire. Ardusat has re-launched as an education tech company with an exclusive technology partnership with Spire. This library is an incomplete version of an old satellite SDK Spire (then Ardusat) was working on. The new SDK is at the repository linked above.