If you mean fast rope script i'm assuming you have the BAS blackhawks, I think that script only works with them. If you look in the readme it says "As an extra bonus, it is also possible to allow a AI piloted helicopter to insert another AI squad via fast rope, at the chosen Waypoint.
To do this;
1) Place a helicopter on the map with its Waypoints.
2) Place the AI squad on the map as a separate group and with its Waypoints.
3) On the Waypoint at which you wish to insert the squad, use this line;
CHOPPER exec "\BAS_mah60\FX\BAS_AIRope.sqs"
Replacing "CHOPPER" with the name of your helicopter.
When the squad has been inserted the helicopter will continue on its waypoints." As it says replace the name "CHOPPER" with the name of your helicopter, call it whatever. Put the name in the name box when you select the Blackhawk. You put the line of script in the "On activation" box in a waypoint (F4) "CHOPPER exec "\BAS_mah60\FX\BAS_AIRope.sqs". This will then initiate the fastrope script and once the troops have been disembarked the helicopter will fly to its next waypoint. If you can't get it to work make sure you have included ALL the brackets etc otherwise it won't work. Its good to set a waypoint just before the fastrope point to slow the chopper down and make its speed "limited", then set it to full or normal as it flys to the waypoint after the drop off. Hope this has been some help to you. Happy mission making.
GI-YO