Hi Janos,
I try it to solve this issue with changeing keydb.xml file. First I found the corresponding encripted fields.
I have delete first that field from entry ABAPSchema_password and try it to continue the installation process. The result was the same....
After that i have changed the pass to every entry into file, the result was more errors :-)
Solution: Start from the biginning!
Thanks,
Irena