(Note: MultiMC 3 is no longer being maintained. See https://github.com/Forkk/MultiMC4 instead.) A Minecraft tool that allows you to manage multiple installations as well as install and uninstall mods by simply dragging and dropping them. (This is the C# version)
From changelog: "Update if latest build number differs, not only if it is higher than the current one."
Starting MultiMC now asks if I want to "update" MultiMC from version 62 to version 4.
Solution: Reverse this change.
EDIT: Noticed that there's a new project on Jenkins "MultiMC 4 - Windows". Slightly confusing. Can't rename the original project name?