And there are two warnings:

1. ISO-8859-1 instead of UTF-8
2. [Einige filemtimes scheinen außerhalb des Rahmens zu sein]
   Please check "zp-core/zp-extensions/tiny_mce/plugins/ajaxfilemanager/debug.html "
   The debug.html is a 0 Byte file ?

At point 7. the udate-instraction means: " Make sure everything checks out, and click go!" But there is no "Go" - only a login form. And after i fill in my username and password: The website can not display this page !

Can someone help ?

I've got it ... sorry.
Changing to the default theme, before starting the update and it works properly !

best regards
Helmut