you can get it >>
 here      just click on the DOWNLOADS on the left hand side      
     move dn till you see the NO CD PATCH  <<   DL it 
     open il-2 FB folder find the rts.dll file reome it ( save some where if you want)  and place the new DL file in its place .. 
           Remove cd ..start IL_2 FB  and it should start without the cd.