I have 4.21, and want the latest version, which is 4.22. But when I went to the site to download, I was taken to a page saying I have to pay $1.39 to download it. You can see for yourself at http://www.memtestosx.org/ I'm surprised. Isn't this against the licensing agreement? Memtest is open source software, and the author took it and modified it for OS X, and is now charging people to download it. Doesn't the GPL require that the software be freely available for download?