Just had this deployed here (the Autumn release) and am flicking through the release notes and came across this:

Options 5.7
Now released in 32-bit technology to enhance compatibility with
current Windows technology. Includes functionality to drag and
drop on classes in blocks and pupil/students in classes via the
Solution Editing page
So, what they've done is release a version of the software that would require legacy emulation etc... on 'current windows technology'.

Made me smile anyway