OpenRA - Requires Mono 4.6?

It seems that OpenRA requires Mono 4.6 with the version available in Lutris. The version available in GetDeb for Ubuntu 16.04 does not, which uses Ubuntu 16.04 Mono (version 4.2):

OpenRA versions:
Version from GetDeb: 20170527-1~getdeb1
Version from Lutris: 20170527

Would it be possible to get a Mono 4.2 compatible version to support Ubuntu 16.04 without weird PPAs required?