I wrote some code reading data fast from a TCP device. It worked reliably under Mathematica 10.3.1 on Raspberry Pi 3B+ and 10.4 on Windows 7, but no longer under versions 11 or 12 on either platform. On my Windows PC I kept 10.4, as fall-back. But how can I downgrade on the Raspberry Pi?
sudo apt-get install wolfram-engine
installs version 12.0.1 and
apt-cache madison wolfram-engine
only shows that version as candidate.
Any idea how to install version 10.3 on the Raspberry Pi?