Thanks for providing that info.
Since release 4.1.7, Resolume is Gatekeeper compliant. Unfortunately, this breaks compatibility with the installer for OSX versions that do not yet support Gatekeeper ( like your machine running 10.6 ).
Apple has provided a free update for 10.6 users that addresses this issue: http://support.apple.com/kb/DL1512
If you download and install this update, you should be able to install Resolume again.