Squeak 4.3/4.4 installation currently broken

I needed to make a new filetree repo and so followed the SqueakInstall instructions. The "Load FileTree from Git repository" step fails though. First, I get a nil not understanding `#directoryExists:` because `MCFileTreeFileUtils install` must run first to initialise the `Current` classvar. Next, I get a `#subclassResponsibility` in `MCFileTreeFileUtils >> #directoryExists:`.

What am I missing?