I use a Mac and I Pad. Will I be able to upgrade my TIU on the Mac or must I use a Windows PC.?
The Loader Program can be run on a Mac that has a Windows environment installed. The DCS WiFi Companion 2nd Edition discusses how to do this on pages 155-157.
Also I have the 2nd Edition of you DCS Compainion and in your WiFi book foreword you mention the 3rd Edition. Is the 3rd Edition a must to get the most of the WiFi book?
No, not at all.
The DCS Companion 3rd Edition only has a single chapter that discusses the Standard version of the DCS App. That information is a small part of what is in The DCS Wifi Companion 2nd Edition.
This and a whole lot more about DCS WiFi is all in MTH’s “The DCS WiFi Companion 2nd Edition!"