The cursing has already started. You’ve installed CS4, but most of your studio’s active projects are still in InDesign CS3. Now each time you double-click on an InDesign CS3 document in the Mac Finder, it opens up in InDesign CS4.
InDesignProxy is a free utility that fixes this annoyance by working as a ’stand-in’ for InDesign. Drag any INDD file onto the InDesignProxy application, and it automatically opens your file in the correct version of InDesign.
Open InDesign docs in the correct InDesign.