Step by step installation:
I know it is a straight forward app, but with 50+ folders and 600+ documents, some instructions still help,

This is for english, all other language should be similar.

1) Got gvm up and running
2) have SD slot is optional, good to have it installed
3) dl the metro-int from thread 1 to desktop, PC or mac
4) extract the whole thing, winzip would be just fine
5) transfer the whole folder to your tablet, /media/mmc2/MetrO
6) inside gvm, install the metro-en.prc, this is your english metro prog
7) go folder en, and pick your city, and install it

Now you are ready to go
It is also good to install MetrUp for automatic update, same link, down the .zip file, extract and install the .prc. Please note that, MetrUp will update your cities whether they are in memory or SD slot. However, MetrUP will NOT update the program itself if the program if in SD slot. You just have to manually do the update, only for the program itself.

enjoy,

bun