Answer:
The "Simulate and Generate Wind Loads" feature for exporting models to RWIND Simulation is available in RFEM or RSTAB as of version x.21.01 from 22.10.2019.
With a valid service contract, you can download the current program version from your Dlubal account. Simply log in on this page:
If you do not have a service contract, you can download the program version you have purchased on the following page: