I would check to see if there is an option to uninstall Edge Preview in
Control Panel > Programs and Features (Vista/Win 7) or Add/Remove Programs (XP)
Applications > Utilities > Adobe Installers (Mac)
After uninstalling try running the installer again
thanks for your annswer but i cant find any uninstaller for Edge Preview there.
What to do?
Lgblom which operating system are you using? Where exactly did you look for the uninstaller?
i use Mountain Lion 10.8.1 and i search in Spotlight för Edge Preview.