Gatekeeper disabled and still won't open my app

Hope someone can help me with this. I downloaded blender (a free 3d software compatible with 10.8) I disabled gatekeepr switching to allow application downloaded from anywhere and still doesn't open the app, I tried the right-click open the control+open nothing. Same situation with a demo version for video plugin for final cut and motion and same result. I try to open same software with a mac mini (os 10.6.8) no problem at all.
Please please can anyone help me with this? Thanks in advance!

http://mirror.cs.umn.edu/blender.org/release//Blender2.63/blender-2.63a-release- OSX_10.5_x86_64.zip

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