The BlueFire for Trucks App has been superseded by the new BlueFire Apps. See this page for more info on BlueFire Apps.
If you have BlueFire for Trucks installed, you need to update to the latest version (8.0.0) before installing BlueFire Apps.
Note, if need be for Android devices you can download BlueFire for Trucks version 8.0.0 from this link and then side-load it.
You also need to migrate your App data to BlueFire Apps. The latest version has instructions upon startup and in the Getting Started document's 'Migrating Your App' section.