I think it is owned by ECN (Energy Research Centre of the Netherlands). You could ask them directly to provide you with the program, explaining why you are interested in it. I do not think it is publicly available.

I agree with Mr. Ricardo Fernández that the Rfoil code is owned by ECN. So it's confidential. One may not simply search and download it publicly. You or your university can get it commercially. Or you could have a try to ask ECN for help to get this code.

Jinane Radi Rfoil is a software tool for designing and analyzing airfoils. It may be downloaded from the Rfoil website at the following link:

http://www.rfoil.com/download.html

To download Rfoil, go to the homepage and click the "Download Rfoil" button. This will result in the download of a zip file containing the program. Once the download is complete, you may unzip the files and install the software on your computer.

I hope you find this material useful! Please let me know if you have any queries or require any other support.

@Qamar Ul Islam at least for me that webpage you link sends me to a completely different software also named Rfoil, but it has nothing to do with aerodynamics of airfoils.

Have you actually downloaded and used the software? Else, I would recommend to delete your post in order not to confuse people '^^

hello Mr . Qamar Ul Islam, thank you for your response . i think its not the same Software we talking about , the link you share is about other things

sincerely