A ver, según la pagina de Apptap dice que no es necesario el Jailbreak pero a mi me daba error si no hacia el Jailbreak:
There has been some confusion -- If you already have Installer.app on your iPhone, you do not need to download and install anything from here! These updates are only for the initial installation or after a firmware upgrade or restore of your iPhone! Also, there is no need to jailbreak before installing AppTapp!
Pruebenlo y lo comentan.