Jerry's script works fine as I already posted but it installs 3.5.6 Beta.

When I try and install the latest supported build it throws an error.
Same when I try the steps on the post above by Wolfgang.

The issue seems there is no Raspberrypi OS/ Buster version of the repository to download.
 #sudo apt-add-repository ppa:mutlaqja/ppa

So I can compile the nightly 3.5.6 beta but not the stable release.

Any help is welcome.