3.6 was not released for the Sansa Clip.
Where did you find these links?
Ahh, a known bug.http://www.rockbox.org/tracker/task/11621
3.6 is a release version for stable targets, and the Sansa Clip was not promoted to "stable" status until after the 3.6 release. Just use the current build and you'll be happy, I promise.
Someone remind me to unsticky this come 3.7 or the closure of the task.