If you use Tweetdeck you probably already know they screwed the new version (1.0) and you want to revert back.
Unfortunately since they are now part of Twitter I had a hard time finding the older build and decided to share it.
Some user have experienced a
“This application cannot be installed because this installer has been mis-configured. Please contact the application author for assistance.”
They solved it by uninstalling all previous versions of tweetdeck. Make sure you don’t have another one already installed.