[Typo3-shop] After tt_products update hole site is down

[Ralph Witte]

Hi all,
I hope someone can help me out of this mess.
I updated to the current tt_products version. But it seems that 
something went totally wrong.

After the updating my hole test area is down. No login, no backend or 
frontend. I have access to the install page and that's it.

Any idea, hint or workaround what can be done now? (I want to keep my 
tables).

Thanks in advance
Ralph