I finally managed to download and install Yellow Tools Independence Free. It seems to work fine in Cakewalk Sonar - if it is the only virtual instrument installed. However, when I add an instance of it to any project that has an instance of Kontakt2, etc. it crashes.
The error messages aren't very helpful. It says that the independence dll is the module that is at fault. The exception code is "c0000005" at address "6195FC8D:00000002:0012DA50".
Also, Yellow Tools doesn't seem to have provided an uninstaller. And, if I go into Win XP Pro's control pannel, there is no entry for Yellow Tools Independence Free.