Quick introduction to the Solomons map

[Les]

I don't know, did you follow the installation and loading instructions included with the map and missions?

1. Close IL-2 1946 program.
2. extract (unzip) folders "Missions" & "Quicks" into your "IL-2 Sturmovik 1946" folder.
3. Open IL-2 1946 program, click "Quick Mission Builder", select new map "BW_Slot42".
4. Load quick mission "us-henderson.quick" or "ja-henderson.quick"
5. Click "Fly"
6. Enjoy your first big battle in The Slot.

I didn't install it that way myself, preferring to extract to a new folder on my desktop and then move the files manually, but those steps above (and the folder structure of the files themselves) tell you where everything should go.