Hi Rich,
The method you mentioned here is a method used to install the Runtime not the permutation.
If you really mean you want to uninstall a permutation, then the only place to uninstall a permutation is in the Code Protector. Currently there's no way to uninstall a permutation via APIs. In Code Protector, please go to Permutation tab (beside Project tab) -> select the permutation you want to uninstall -> either right click and "Delete Permutations", or go to "Permutations" from menu bar and "Delete Permutations".
But if you mean you want to uninstall the Runtime, then I am afraid currently it's not possible to do it via API. There is actually a way to remove the Runtime but we don't encourage people to do it. If necessary we will send you a direct email with related info.
--Peng