Hi @jdcoburn
Welcome to the FreeRTOS Community Forums !
You are downloading FreeRTOS-LTS which includes the Long Term Support (LTS) packages .
You need to download the FreeRTOS.zip from GitHub mentioned here .
You shall find the project files for this demo are located in the FreeRTOS/Demo/CORTEX_MPU_M33F_NXP_LPC55S69_MCUXpresso/Projects/MCUXpresso
directory.