My sensible seven tips. Manuals are there also for you to read and check for problems and trouble shooting. Some install application can have late braking information for you to read regarding compatibility issues. I did not need the template files just the application was fine. I mean trying to update your iMacs firmware with a PowerBook firmware just isn't going to happen.
Games can also install older extensions and control panels, namely 'Game Sprockets' and 'MacIPX'.
If an install application tells you to 'start up with extension off' do it. Wasting a few minutes might save you hours in problems. Read the installation section of the manual first. Then check the online documentation, including the latest 'read me' file. Don't try installing anything until you are happy that it will work on your hardware, and that you know how to install it.