To verify you have 2.15, try to make a local server or alternatively join a FH2 server, such as HSLAN.
When you are making a local server, look for maps such as:
- Tunis
- Fall of Tobruk
- Siege of Giarabub
If these maps are in your map list (for regular Conquest of course), you have 2.15 version.
If you choose to join servers like HSLAN, and you load in properly no matter which map is and you get to play, then you again have verified you have 2.15 version of FH2.
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Normandy maps on the homepage are news from the upcoming 2.2 version which is currently in development. It will be released at later time for the public. Stay tuned!