Here you can download for free the Grass Valley HQX Codec Pack for Windows and Mac. With this Codec Pack you are able to work with the high quality HQX Codec, as well as decode and encode your material. You can use the codec without any limitations.
The codec supports 8 and 10bit color depth, alpha channel, resolutions up to 4K (SD, HD, 2K, but even any format like e.g. 120x540).
Grass Valley HQX Codec Pack for Win (Version: 8.50, exe, 37,9MB)
Grass Valley HQX Codec Pack for Mac (Version: 1.05, exe, 0,5MB)