Solutions
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Pear's post in (There is no request channel) Request to add icon for the iOS version of classicube was marked as the answerIt was just added two days ago and works now. Just install version 1.3.8
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Pear's post in Classicube Server on Raspberry Pi was marked as the answerFor the client: just go to the download page and click on the Raspberry Pi tab, download the correct architecture, and follow the instructions.
For MCGalaxy, get Mono (sudo apt install mono-complete on a Debian based distro, can't remember the rest) and get a copy of MCGalaxy here and then run mono MCGalaxyCLI.exe in the Terminal.