RBRPro does not require the installation of the original game. It is completely standalone.
We can support you through our facebook group or our Discord Channel. You will find the links in the manager.
Only some events (six events per season) are reserved to donators. You will find further details in our Championship guide.
To unlock the full features you have to register and become a donator. It all can be done from within the manager. It's very easy!