How to open applications regardless of required version?
That check is done by checking the application's plist.


Right click on the application and click "Show Package Contents"
Open "Contents"
Open "Info.plist"
Scroll down to where it says "LSMinimumSystemVersion" or "Minimum system version" depending on the editor you're using.
Replace the string on the next line which should be "10.8.5" (or to the right of the key, again, depending on the editor) with "10.7.5". Try to open the app again.


You may have to restart after this change.