If you want to use the body tracking feature that comes with the Unity SDK you have two options:
- Look at the developers page (https://orbbec3d.com/develop/) and check if there is a new version. If there is a new version you need to update. This is the only way to use the body tracking for free. On the page there is always a deadline. After that the free version stops working. Currently the deadline for 2.0.19 is 31th of March 2020. The time slots are 2-3 months from my experience.
The Orbbec Body Tracking library (included with Astra SDK) is free to use until March 31, 2020. After the free trial expires please plan on purchasing the complete version here or update to a newer version before that date.
- As stated in the citation above you can buy the license, however it is unclear to me if your endproduct needs a continous internet connection for the license to properly work. I asked the question on that topic here: License activation only online?
What i do know is that you get these licenses once and you need to buy one for each of your cameras. I think that if you buy f.e. 5 licenses that you get one license that can be activated 5 times.
Regarding you second question about the angle. I had the same issue and i fixed it by putting the parent transform that contains the body parts into another game object and then you can rotate that top level parent as any other game object.
Hope this helps