Still there, but it sounds like you're flipping between repositories. If you're using google street view, use this script to download them onto your PC in sqlite format. Usage is as follows:

getmaps GStreet.sqlite -t 44.86000 -l -88.43000 -b 39.83000 -r -81.62000 -z 16 -z 14 -z 12 -z 10 -z 8 -z 6 -z 4

"getmaps" is the script. GStreet.sqlite is the database it will build for copying onto your tablet. the -t, -l, -b and -r are the four GPS coordinates you will find via your tablet. IE, zoom in on a particular area, then go to "menu -> maps -> manage maps" then click on the "area" tab. The third and fourth lines will have the four coords you need. Just plug those into the script.

Lastly, all the -z's are the zoom levels. In most cases zoom level 16 is the highest you'll need, and you should only need the even numbered zoom levels. So like what I did, 16 down to 4 should be plenty. Of course, the bigger the area you do, the longer it's going to take. So typically I only recommend going no lower than zoom level 8 for areas as large as states or small countries, but 6 and 4 are fine for specific cities.

You don't, short of actually loading them up in MM and seeing what it loads and what it tries to auto download.
MM caches maps in its database. Just doing that leaves them available for next use. Unless you somehow either delete the database or tell it to purge all maps, it'll just download everything and keep it indefinitely.