Mac veterans have been singing Alfred's praises for years, but some of Apple’s newer users might not have heard about the mighty app launcher. Free to all but the most serious professionals. Changing Gatekeeper's settings (10.12.x / 10.13.x)—the same steps as above, but for Mac's Sierra and High Sierra OS; Manually allowing individual applications to launch—this is the best method for users who do not want to change the global setting to allow all applications to run.
Yes, the install is tied to the computer not the User. You can create as many Users as you want in System Preferences Account (Lion - Accounts is called Users & Groups) Microsoft Office MUST be installed in the root Applications folder so any User can access. If you install in the Applications folder in a User's account only that User can use the app. Macintosh HD Root folders Applications.