Hi Jim,
If you download the update it has its own installer not a windows wizard, You should just press next on the front screen then install on the next screen and it all comes about automatically.
You dont notice anything other than you should have less blank spaces, the changes are made to the databse only nothing else.
To check if it has installed properly, start up Radarbox and go the the top left of the screen and you should see file, press it and from the drop down list you will see databse explorer, click on it and a box will open up on the screen. At the top of the screen is "select table drop down list, select aircraft, then press "show all" then "add record the screen will then go to the end of the database. The last line should be 406392 in the left hand bottom box with G-NSKB in the next. If tha tis the way it is everthing has been istalled OK.
Have a look and let me know.
Alan