Hi genius gogo,
For KW41Z, MCUXpresso SDK builder includes the wireless stack. You can follow this guide to generate a downloadable SDK package.
For KW2xD there are currently no plans to integrate the wireless stack into the SDK Builder. The connectivity software for KW2xD and MCR20A is available in the Protocol Stacks section in the Software & Tools tab from the KW2xD product page.
Regards,
Gerardo
