@rarest_babypepe You do have Fastboot and ADB installed? This is important for the UT installer to run.
I tend to install Android Studi to make sure the latest Fastboot and ADB drivers are installed.
@bluekenny Have moved your post as it was in the wrong place.
The FP4 is still under development and there is no RC or stable channel as yet. OTA-24 will not change that, it will only happen as the port progresses.