MP.DL: Maps and Plans as a Download
This is where you purchase a download of all the files from the CD of Maps and Plans. You should first read the description of it here, to be sure that this item is what you want. There is a link to return you back to this page at the end of that description.
If you add this item to your cart and buy it, you will be able to download a link to click on. The actual files from the CD are quite big, totalling 140 MB, so inevitably they will then take a short while to download - a minute or more, perhaps.
What you will eventually end up with is a zipped folder. If you have Windows on a PC, right-click on the folder to get a menu and choose 'extract all...' or 'unzip...'.