Why download? You should just use the repositories instead.
http://www.gronmayer.com/it/
shows that simple-launcher is in
http://repository.maemo.org/extras
bora
free non-free
and camera is in
http://catalogue.tableteer.nokia.com/certified/
bora
user

Add those repositories if they're missing. Then refresh your application list in the ap. In the application manager you'll find a list of all installable applications, including simple-launcher and camera. Click on them to install.

If you access that first link directly from the tablet the 'click to install' flag will do all of that in one go. The main point though is that it's never necessary to download and install applications that are available in repositories, they're installable just by selecting and clicking right in the application manager application list. No explicit download necessary.