The old style WorldMapKitLayer had been signed as "Obsoleted" in V9 and had been removed this month, we removed that because the data is too old, and hadn't get updated since four years ago.
We suggest you upgrade to V10, you can directly use our new class WorldStreetsAndImageryOverlay for it, you can view the new page https://maps.thinkgeo.com/ which shows the new render styles.
If you want to use our new server with your code, please let us know how you are using it, the overlay, the layer or the code to build request url? The new layer name is OSMWorldMapKitLayer and you should want to set its map type before use it.
Any question please let us know.