RWIND Simulation is exclusively compatible with RFEM due to the CFD modeling, which requires a finite element calculation. A model created in RSTAB can be opened in RFEM. The wind load parameters can be defined in the Simulate and Generate Wind Loads dialog box of RFEM.
At the bottom of the Wind load tab, it is possible to remain and automatically generate loads for the corresponding load cases after the CFD calculation has been performed in the background.
If you would rather perform the wind simulation in RWIND, click the Open in RWIND Simulation button in the Load Cases tab.
To obtain the trial version of RWIND Simulation, proceed as described in this FAQ:
FAQ | Authorizing RWIND 2 Trial Version on Single-User Computer