How do I use ams files to have Maps work in Multiplayer Game of Bus Company Simulator

In the multiplayer game I have tried to install maps from Add manger and it now comes in .ams files I can not use them to download maps and update my splines in maps. Just want to know how too as it is getting harder to play the Game Bus Company Simulator Multiplayer I've been having all sorts of problems that I downloaded a few days ago. They don't work now always something missing from the map but now. I downloaded the map on the Omsi site anyone know what to do .....: /? ((