So, the bug actually is:
running the file "AIO_CDB_NonNet_Full_Win_WW_130_141.exe" results in the creation of a folder named differently than expected by the same application further ahead.
I did what was said in message 1 of "Bug finally found - HP Photosmart C7280 Full Feature Software and Drivers Win 7 64 bit" - create a folder with the name shown in the error message and move all files from the 7s... folder to this correctly named - and could almost complete the installation (at first, the error was shown right in the beginning, now it was shown at the end of the process)
I got an error situation code:15647869
Thus, I have an installation unsucceeded that refers to a process that brings me all the way to the beginning, I think.
Tomorrow, I'll pay some more attention to this mishap.
Thanks for replying.