Installation con CS4 auf Win8.1 gibt Fehlermeldung: "Installationdatenbank beschädigt." ?

uninstall, clean, restart your computer and then reinstall.  details are here:  http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html

if your cd is damaged, use an uncorrupt installation file:

if you follow all 7 steps, you can download a trial via one of the links on this page using a browser that accepts cookies: http://prodesigntools.com/download-adobe-cs4-and-cs3-free-trials-here.html

and activate with your serial number.

if you have a download problem, you didn't follow all 7 steps.  typically, failure to meticulously follow steps 1,2 and/or 3 is the problem, but your browser must also allow cookies so that's (a restrictive browser setting) another potential source of problems.