2 Problems here:
a) Without explication that checkmark on green circle area is useful for nothing, it has to be explained on that page what version is for what purpose / user
b) 4.0.0 in reality is is a very very buggy Alpha version, it's not a good idea to offer it with green checkmark and without warnings "only for early adaptors with experience ..." on the same page. The hint concerning "Versionshinweise" (release notes) is not appropriate, Version 4.0.0 is not listed there and such a warning has to be on the same page as the download link
Seems to be fixed in the meantime.