If you’d need a specific version of mono other than the version which ships with Visual Studio for Mac, you can install any available mono version with a simple Script.
All you’ll need is the macos (universal) pkg download URL of the mono version you want to install, which you can get from: https://download.mono-project.com/archive/
Simply add a Script step to the relevant workflow(s) as the very first step in the build (the script doesn’t have any dependencies so it’s safe to run even before Git Clone etc.):
#!/bin/bash set -ex # Get the macos universal pkg installer download url # for the version you want to install from: https://download.mono-project.com/archive/ # and set it here as the value of this variable: MONO_MACOS_PKG_DOWNLOAD_URL='https://download.mono-project.com/archive/5.2.0/macos-10-universal/MonoFramework-MDK-188.8.131.52.macos10.xamarin.universal.pkg' # create a temp dir and cd into it mkdir -p /tmp/mono-install cd /tmp/mono-install # debug: mono version before the install mono --version # download mono mac installer (pkg) wget -q -O ./mono-installer.pkg "$MONO_MACOS_PKG_DOWNLOAD_URL" # install it sudo installer -pkg ./mono-installer.pkg -target / # debug: mono version after install, just to confirm it did overwrite the original version mono --version # just for fun print this symlink too, which should point to the version we just installed ls -alh /Library/Frameworks/Mono.framework/Versions/Current
That’s all! When this script finishes the mono version which you specified should be the used by the tools which use Mono (including Xamarin / Visual Studio for Mac).