You use a mendix 9 starter package in mendix 10.
Don't know the detailed bits of this starter package. But in general, use mendix 9 starters in 9. If you want to start in 10, pick the version for mendix 10.
If that doesn't exist, in the Siemens portal, start your project through home.mendix.com or create your project directly from studio pro
Hope this helps