1) I have MC 11.1 on XP PC. I purchased a new Vista PC. As I understsand it I need to d/l MC 12 to the new vista machine and upgrade the 11.1 to 12 using the track for updates from within the MC 11 rather than try to purchase from a new d/l of 12. Once I kget that installed I jcan use the same key for the new vista machine - right?
I'm not 100% sure I follow your question, but I think you're right.
Use the old computer (which has MC11.1 installed on it already) to purchase MC12. Then, you can simply install MC12 on the new PC (you don't ever need to install old versions on that computer) and use the MC12 key you received to license that copy too. You can then use both copies if you want, or uninstall it from the old machine. Whichever you want.
2) With the MC 11 track for updates it identifies update file it says costs $19 odd and then the file d/ls only about 45Kb and then fails - is there another d/l method?
That shouldn't be happening. The best place to download MC12 is from the "sticky" thread at the top of this board on the forum. The current newest version will always be found "stuck" to the top like that.
If that download doesn't work, there may be a problem with the configuration of your Internet connection on your PC.