I have the same issue, the new laucher tells me i have 5 modules available for installation but when i look at the list it is empty.
When i open the In Game module manager, it tells me that i can install FC3 at each start up of DCS
If i have checked the enable boxes fot the Su25, the Su27, the Mig29 the A10A and the F15C, i have the same message telling me that i am not authorized to use those planes...