there are currently three ways to get the RC
- get 5(?) points on this website (which is basically trivial)
- subscribe to orion+
- sponsor an issue on this website (I think)
I don't think advertising "subscribing to orion+" is a good idea, especially not at this stage
also, there is no free/paid versions, but the terms beta and RC (release candidate) are suggested
you don't need to pay to use orion, or the RC