Hello Bebbe,
as you can see no-one offered you help and there must be some reason for that.
I guess what you need to do is to specify by yourself what kind of problems the script has in multiplayer.
Then post about those problems in this thread.
Then people can start giving you answers on how to correct the problems.
There are knowledgeable people around here, you just need to be prepared to get the work started by yourself and they will come to the help when you have specific-enough questions.
Best Regards,
Baddo.