So that was you running out of BestBuy? I was right behind you.
OK so here is what I did.
1. Install latest version (2.5) of TomTom Home from the website
http://www.tomtom.com/plus/service.php?ID=17&Lid=4 and create a login for yourself.
2. Check for updates on the TT Home and it will install version 8.30 of the software and it will also erroneously inform you that you have the latest map. YOU DO NOT.
3. Contact customer support and tell them that you see they have a map version 8.xx for sale and your unit isn't offering this as a new purchaser update. They will give you a case # and email a link and ask for a return email with proof of purchase attached to a question.
4. Call them back after you respond and they will then upload the latest map to your PC's TT Home folder and then automatically to your 720 (takes about 1 hour)
5. Once installed, reboot. After you reconnect to computer, close TT Home. Then access the TT 720 as a disc drive through My Computer. Create a folder somewhere on your PC (I use Desktop). Copy and Paste the contents of the TT's entire flash drive using Windows Explorer NOT TomTom's backup.
6. Set Folder options under Control Panel and check Show hidden files and uncheck hide file extensions of known type.
7. Using Notepad create a file following instructions at
https://www.tomtomforums.com/showthread.php?t=6594 and place it on your desktop. Note: First time I didn't have "hide file extensions" unchecked and there was an extra .txt hiding on the file name rendering it useless.
8. OK now when you link the 720 to the computer, again exit the TT Home and open up my computer and you will see the 720 as a drive. Explore the files and add the .dat file to the ASR folder and then open the North_America_2GB folder under the Downloads from TomTom (usually in My Documents/TomTom) and copy all or whichever you need (US State sapecific and Canada) Cspeech files back into the North_America_2GB folder on the 720's drive and after a
reboot you should be all set.
Credit to all who crossed this river before me and please correct me where I am wrong.