Hey , how about taking some Screen shots of your files you have and posting them on here, so we can see , something , that'd be a big help too !! I do hope you know - you have to OPEN up that ZIP folder that you downloaded , then maybe, depending on the Creator of the aircraft , also have to open a few more folders to get to the actual Aircraft folders & files - till you get to this folders that will say - Model / Panel / Sound / Texture / CFG file below all those and usually another brown looking file installer file below the CFG file. close them all up and get back to the 1 folder previous to that and right click and hit COPY ,, then go to your MAIN AIRCRAFT folder and right click & hit paste and it should show up and load up & fly properly , just wanna make sure your NOT trying to "Inject" a Zipped Folder into your main flight sim Aircraft folder - it won't work if its a ZIP FOLDER ~ !!!!! I install ALL My aircraft manually and inspect each and every file before its ever INJECTED into my FSX GOLD Acceleration edition , and I remove / delete / or save all un-necessary folders & files that don't have anything to do with the Aircraft flying ability - such as - Diz files - read me files PDF Files extra photos or Extra thumbnail photos - I only want the BARE BONES of whats truly necessary to make the aircraft fly in that "AIRCRAFT folder" section and none of the Aircraft rely on any PDF File or Diz files or read me files or any extra thumbnail files - all that extra stuff is redundt and just takes up valuable space , I recently went thru and cleaned up & out All 147 of my Aircraft files and I was amazed at how much space all those PDF Files and read me files and Diz files were taking up - add them all up in size, and whooof - quite a bit of space they were invading on your hard drive - kinda like extra dust around your house or extra junk food left over in your refrigerator - time for it to go, save the important stuff to another location and TRASH the rest !!! good luck !!
