Help Help needed with sat nav app since update please

[cypher79]

Hi guys, so i had Navigon sat nav app on my xperia mini which was working great before the update, however since the update the start-up icon has vanished? however when i plug the phone into my laptop i can see that there is still a 1.8gb Navigon file in there? so i run my application installer but it doesnt find anything?

do i need to create an .apk file or something for the installer to find?

any help with this would be great guys