1. All you need to do is visit IDM installed directory in Program files, here is its path for navigation in Explorer “C:\Program Files\Internet Download Manager”. 2. And drag-n- drop IDMGCExt.crx extension onto Chrome://extensions page or you can open that page by Chrome menu>Tools>Extensions. That’s it IDM Integration extension will be installed for chrome. *Make sure you checked ‘Hide Extensions for Known file types’ on Folder Options dialog to see IDMGCEXt with crx extension .