To install these packages, you need to go to Settings/Applications and tick the box that says "unknown sources". What this means is that you allow your phone to install applications from other sources than Google Android Market.

You may only have one instance of the application installed at once, meaning only one week may be installed at once.

If you have previously installed a more recent version of the app, you need to uninstall it. Go to Settings/Applications/Manage applications then select "Big Words" and click Uninstall.

To download, simply click on one of the links above. Once it's downloaded, click on it and it will install it, provided that you have followed the steps above.