I have bought the early bird and I have a license. When I try to update from b70 to FM 5 there is no option to download. What shall I do?

there is one, but hard to find.

That is not particularly helpful. I have also purchased a license but am not able to find an option to download FM5Pro. How do I do it?

The solution: Go to https://www.boinx.com/download/ and download the demo version. When you open it, it will automatically pick up your license from the beta version.