[TYPO3] Downgrade?

[lists.netfielders.de]

Hello!

Just created a new website using the wonderfull version 4.0 just released. 
Don't get me wrong: I LOVE IT!

All is well, but there are a few things, that is still not working. Perhaps 
I just can't find 'em. A couple of examples are:
- click-enlarge on my pictures - where is it?
- using ImageMagick-6.2.5-Q16 I can't get my thumbs shown
- not enough extensions yet

Anyways - I might be wrong. But is it possible to downgrade to version 
3.8.1?

-- 

Kristian Wind