It's easy now Grumpy. Go to the bottom of the first post of this thread and download both the Grumman J2F-Duck folder and the Wing fix update located right under it.
The readme.txt is dated and doesn't mention the new stuff, but the Duck_README.txt has the information you'll need to add to your air.ini so don't forget to do that. Also, the 4.09 version is the default installed so if you're running 4.10 you'll have to copy everything in the fm410 folder to the main one and overwrite the existing files to convert it to 4.10.
Don't forget to apply the wing fix update and you have the latest version available. Fly the J2F-DuckS, it has all the latest stuff. That's it, piece of cake.