How to re-install a lost app?

I purchased an app and I shut down my mac in the installing process, now I can't find it anywhere and I can't install it again via the app store. Please Help!

Found this:
Try the following steps in order:
Quit the App Store
Eject all disks (including any .dmg files you have mounted)
Use Spotlight to search your hard drive for anything with a similar name to your application.
If you find anything related to the application in question remove those files.
Delete the file at ~/Library/Preferences/com.apple.appstore.plist
Delete the file at ~/Library/Caches/com.apple.appstore/Cache.db
Delete the file at ~/Library/Cookies/com.apple.appstore.plist
Delete the file at ~/Library/Cookies/Cookies.plist
Open terminal and run this command:/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user
Logout of your computer & log back in
Reopen the Mac App Store
Try to install the application again.
Source: http://apple.stackexchange.com/questions/25333/app-store-thinks-apps-are-install ed

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