I now have Home Assistant OS working on my Raspberry pi 5 
I downloaded the develoment build and put it on SD card with Raspberry Pi imager.
It was not all smooth sailing because I setup my network credentials via Pi Imager but apparently those settings did not get applied when the development HAOS was written onto the SD card. So When I loaded the SD card into my Raspberry Pi 5 and booted it up I was expecting to see the device onto my network and that I could SSH into it. But that was not the case. So I purchased a micro HDMI to HDMI cable and hooked up my monitor. That was hard because the (4k) monitor was mostly complete dark with every two seconds or so a very fast flash where I could see the HA CLI. I had to film or take pictures of the screen at the exact moment so I could see what it said. I then had to look up exactly how to configure HA to connect to my wifi via the HA command line. But I succeeded in the end and I was very happy to finally be able to reach HA via the network. I was even more than happy that I could successfully import the backup that I made from my previous windows Home Assistant installation. I needed to move over HA from my windows computer because every update restarted the PC and at that moment HA was no longer working until I logged in to the PC and started HA again. Very happy that its now working from mi Raspberry Pi 5.
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