Took me a little bit to figure this out. You can drag the new application once installed to the Applications folder and it will be in your launchpad or you can drag the application to the Launchpad icon in the dock. Unfortunately, I didn't think it worked so I tried both methods with MakeMKV which doesn't install to the applications folder oddly. Turns out the apps are added to the next blank page in your Launchpad. I ended up adding MakeMKV twice and couldn't delete either one from within Launchpad. I had to go delete the app from the Applications folder and once I did that Launchpad allowed me to hold click on the MakeMKV icon and then click the X while jiggling. Strange that Launchpad doesn't have a way to prevent two of the same apps from being added or that they can't be deleted from the launchpad unless deleted from the computer.