Thanks for the response.
Here is what I did to get this working, hopefully it is correct, since I could not find an "install" option.
The file downloaded into /media/My Files/My Downloads/ folder when I used the link from the ereader.com website.
I then used Root Explorer to copy into the /system/app folder. I couldn't find an Install option in Root Explorer.
When I restarted my NC, the Ereader app appeared in the Extras area and I can now read my old ereader books. The app is not as good as current readers like the Nook, Kindle, Aldiko, but it has the advantage of natively reading my books.
Thanks for the assistance, and if you see anything wrong with how I installed the app, please let me know.