I tried to install the SDK from the FSX deluxe disc one. It installed and i went into dll.xml and changed disabled to false. I went into FSX and "Tools" Was not there. I have tried soo many things. Please can someone help??? I really need that OPT for my Missions... Oh and I had the SDK before and it worked but then i wiped my computer....
Please see - FS Developer - Wiki - SDK Installation (FSX)