Found the following error entries in the installation:
Default installation language not valid, falling back to first supported language.
Error 1904.Module C:\Windows\SysWOW64\Macromed\Flash\FlDbg9c.ocx failed to register. HRESULT -2147220473. Contact your support personnel.
and 25 erors like:
CustomAction SetLotusNotesProgramDirectory returned actual error code 1603 but will be translated to success due to continue marking
CustomAction DoSubLaunches returned actual error code 1603 but will be translated to success due to continue marking
etc
No FATAL entries