If you are having trouble with the official VTech site, community mirrors host the original installation files: Redeeming Free Downloads for MobiGo - VTech
The VTech MobiGo 2 is a touch-screen learning tablet for children (ages 3-9). Unlike a modern iPad, you cannot simply download any app. Game content comes in two forms: mobigo 2 software downloads
If you physically own the cartridges but want to play them on a PC (or preserve them), you need an emulator. If you are having trouble with the official