Mission Tool builder for FSX

I am having a tough time understanding how this works
. Using it i understand, but how do you install the tool. I have used it before at friends house but when trying to install myeslf it doesnt seem to wrk. If somene can elaberate for me that would really help me out.
P.S.
Look for a new mission regaurding either a USCG Daulphin , and or Jayhawk which i will need permissions and find a freeeware one good enough to use , or the mission will involve the Life Flight Helicopter from my Area in Cleveland Ohio and you will have a series of MedEvac calls ranging from MVA , MCI , trauma arrest , to a cardiac arrest. Input will be great . I would like to know what you all would want.
Thanks much,
nathan

P.S.
Look for a new mission regaurding either a USCG Daulphin , and or Jayhawk which i will need permissions and find a freeeware one good enough to use , or the mission will involve the Life Flight Helicopter from my Area in Cleveland Ohio and you will have a series of MedEvac calls ranging from MVA , MCI , trauma arrest , to a cardiac arrest. Input will be great . I would like to know what you all would want.
Thanks much,
nathan