is it possible to edit files that server force people to dl?

Hello I own a server a build server and it have stargate and easyengine in it it forces people to download easyengine models and materials but not stargate models and materials and it seems alot people disconnect while joining cause of alot of files to dl is it possible to make just people see easyengine parts as error if they dont have it and dont get forced to dl while joining like stargate ? thanks in advance or use an admin mod like ULX.