1. Download the full airfoil performance data libary
2. Unzip/extract to a temporary folder
3. Start Winfoil
4. Click on Import toolbar button or select from menu.
5. Select Winfoil Airfoil Performance Data
6. Browse to unzip folder and press OK to import from the folder.

 If the airfoil data already exists you will be prompted to overwrite or skip.

Screen shots of the steps are shown below.