maybe you can describe, what exactly you mean?
If you downloaded one of the libraries for Kontakt, then these are NOT platform dependent. You need to redirect Kontakt to the place where you unzipped the files.
If you are talking about the Software DecentSampler, that is in fact only VST + Standalone on Windows, plus AU on Mac clearly described here). But hey, you are a Pro in using ProTools+Kontakt, so just use that combination. DecentSampler is a project of the kind and gracious Dave Hillowitz, providing some relief for those who are not in your position to buy ProTools, Kontakt and the like.