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.