CAVS-Easy install; some questions

Installed the current Beta 2.0.8.20 with no problems at all on XPHome SP2.
Although having spent much time reading topics here and checking for details, some questions
remain:

1)Beta 2 runs on Windows versions ___?
2)Signatures/Definitions

a)Is it updating or as read, a new Beta must be downloaded for latest detections?
b)Are Signatures/Definitions information available like most other AV/AS vendors - link please?
3)Where is the typical vendor ‘System Requirements’ and program details particular to new/special features of Beta 2 vs Version 1 on the website?

Thanks very much in advance.