Azure RTOS still available for free in FSP 4.3?

Hello Forum,

I have not hardly use the FSP and have most of my experience with the old SSP/Synergy from 5 years ago.  I have been in hardware mode since but now getting back into software.  Im installing the latest FSP 4.3 and trying to get the Azure/ThreadX rtos installed.  After the install when Im attempting to add a new netx thread Im only finding the FreeRTOS features.   Has Azure/ThreadX been removed from the FSP?  Is it now a paid RTOS feature or no longer supported or have I failed to get it to install by possibly missing a checkbox somewhere on the install?  Also is most of the support these days aimed at the Free/Amazon RTOS or is Azure still fully supported? 

Thank you

Matt