This was a while ago, but I read up on these laws made in Germany, and it was basically to stop CD/DVD copying. There is a good FAQ somewhere that explains it all, I may have even linked that somewhere on this board.
Anyway, it did not apply to software, and that was explicitly stated, that much I do remember. I think the illegality of HD installers is a myth. I guess Aminet wanted to play it safe, or mis-interpreted the law.
IIRC it was an implementation of an EU proposal called the EUCD, the European equivelent of the DMCA. However, the DMCA now has (temporary) exemptions on obsolute software, so if the EUCD has not already, I am sure it will follow.
I wouldn't worry to much about it.