Dont listen to the people that said you are going to have to restore.
Go into the installer, and click on sources. Click "edit" and "add"
Type: ride4.org/shai.xml and hit ok.
Navigate back to the install screen, and install the "All Sources" package. It will install all of the sources that are on the MMI wiki, and a few more.
This will give you access to all of the apps that you are looking for.
(If you want to remove a source, you have to do it one by one in the sources screen)