I see, then that's possibly what's causing your LR problem -- since a few months ago we've updated all the Little Reader content files into LR 2.0-compatible ones, so if you were using the new content in an older version it may not work correctly.
You can download the installer for the latest version of Little Reader from your Account Management page (go to the Purchases tab). Here's a direct link:
http://www.brillkids.com/user/#purchases/littlereaderIn case you haven't downloaded Little Math yet, you can get it from the same page (see above), by clicking on the "Little Math" sub-menu.