hi all. new here so first thing is to say hi.

i am a total noob to OUYA, so i hope you'll be a little patient with me. i am sure the questions i ask will have been asked before, so a bit of promting may well be enough.

anyway, read around the forum about putting games and apps on the OUYA from a USB stick. if i am right, from what i understand, i need to put a file manager on the OUYA first. i read where ES File Explorer works fine as long as not using the latest version, so on the OUYA i downloaded 3.0.5.3, installed it and tried to open it. it immediately closed, showing nothing. thinking it was the version i shouldn't use, i uninstalled it and downloaded/installed the previous version, 3.0.5.2. same thing happened. am i doing something wrong or need an even earlier version? do i need to root the OUYA?
what i want to do, if possible, is simply be able to move stuff from my pc to the OUYA via either a USB drive or an sd card in a card reader. so, am i doing things totally wrongly? am i just missing something silly? can i not do this at all?

hope someone will advise please.

many TIA