Because of a bug in Mono 3.10, I have to revert to Mono 3.8.
Where can Mono 3.8 be downloaded?
At http://www.mono-project.com/download/ only 3.10 is available for download.
At https://github.com/mono/mono/releases only the source is available for download, not binaries.
There is a link to older changelogs, but not to older binaries.
Mac OS X, also Linux if possible.
Here we go, there’s all the files you might need: http://download.mono-project.com/archive/