After hearing about the success of the 64 bit beta version I started to do the upgrade. I grabbed the image file but got stuck trying to download Balena Etcher. The link in your read.me instructions takes me to a list of options none of which seem appropriate for my RPi 4. I searched some forums and even tried a suggestion to use pi-apps to install Etcher, which didn't work. It didn't seem to like my 32-bit OS.So after killing my afternoon, I decided to try using RPi Imager since it is installed with the following line in Terminal:
sudo apt install rpi-imager
Then I used it to burn the image onto a bootable USB drive, and I am now running JJs 64 bit OS with all the other goodies.
Now to test it and migrate all my WSJT and Grid tracker settings.
Hopefully this might help other less experienced Linux folks.
W6LKB