Default [Q] Can't See Zips - Nook Tablet

I'm following this guide to flash a CM7 to a Nook Tablet:

http://forum.xda-developers.com/show....php?t=2037368

I get as far as step 13 where I've installed the image from the SD Card.

Then I get to 14. I reformat the SD card, add the zips for CM7, CM10, and gapps for both. When I put the SD Card back into the NT per the instructions and try to install from the SD Card, CWM returns "No Files Found."

When I reboot the NT, it appears that *something* was installed because I now have the option to use ADW.Launcher and there are new apps SuperUser, NT Hidden Settings, etc.

I've read this thread:

http://forum.xda-developers.com/show....php?t=2059506

When I go into Manage Applications and Development options, the option to install from an unknown source is selected. But I don't see how this would affect CWM.

Any help? I'm going crazy here trying to figure out why I can't see these zip files.