Update 7.5.3. to 7.5.6 DNN3.1 failure

[ibp2702]

Hi,

after update we tried to install the new applicationpaket DNN 3.1.
The installation of DNN didn´t function. The database was installed, but not the application. After this, we aren´t able to delete the database.
What can be wrong?
I search in the filesystem on the server for DNN 3.1 files, but 1 didn´t find anything.
Where can I find the installationpack on the server?

Thank you very much.

Michael