Hi Markus,
from the screen shot that you sent, I can see that you have tried to update to "HotPot v2" several times with only limited success (Valmis!). I think the update is getting stuck somewhere and does not complete, leaving no way out for the administrator.
From the screenshot alone, I cannot tell why the update did not complete, but I have made some alterations to the update script so that it is better able to handle situations where the update has been partially successful on a previous occasion (i.e. the situation you appear to be in).
I put the amended update script into the download for the hotpot module, which you can get from here:
http://bateson.kanazawa-gu.ac.jp/moodle/mod/resource/view.php?id=168
If you have time, please try the update again, and let us know how you get on.
many thanks in advance
Gordon