I'm interested too. Could you tell us, if you got it to run under Win8. I got Win7.
But the game is a little bit old 
On the other side, I can get it used for 1 € + shipping. If I should buy it? 
Installed it today, and I can say that yes, it works on Windows 8, so it will most likely run on Win 7. Since it's pretty old, I'd say you don't need any high specs or special hardware for it. I think the only thing you';; need to run it is the old program Macromedia. So go ahead and buy it!
I only ran the game for about 5 minutes, but it looks really nice! You can tell it's old - it has old style pixel graphics and transitions, but it's pretty. Since it works on my laptop, I can get video!
I don't think I'll be able to take a video of the whole game since I don't speak/read German. I'll do what I can, and post a video to Youtube. I'll take some nice screen caps too.
There's a watership down game? I didn't even know that, and I've actually searched to see if there were any.
It was a long time before I discovered this game! Pretty sure it's 100% legit. It has a link to the German TV series site on the back, (That sites still going, I think. Pretty sure I was on it a few weeks back) and has the KIDDINX logo on the back. I think that must be a German kids TV channel/producer? I think I've seen then before, too.