The crack was not made by me, so credits go to whoever made the original "PMDG_BAe_JS4100.DLL".
 I`m not a coder or anything like that, this is just something i`ve figured by myself and i made this account just to share it with the comunity, so if anything goes wrong blame it on yourself :D
 With that being said , let`s continue with the release notes : 
Version 1.10.1016  Released 11OCT09
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- Modified Engine Start Sounds to ease transition.
- Eliminated reported VNAV CTD error in FMS.
- Eliminated "CTD on Exit" error.
- Updated J41 Configuration Tool to correct for various visual anomalies.
- Modified J41 to account for sensor package on HKG Flying Service J41 Livery. (available from download page.)
- Updated FSX ATC callsigns.
- Added Custom Keyboard Commands for various cockpit controls
- Corrected inverter error that prevented AHRS from dumping alignment when all busses were de-powered and batteries turned off.
- Various visual and artwork fixes to VC and external model.
 TO INSTALL follow these steps in the exact same order :
1. Remove any previous instalations of this plane along with any liveries 
2. Install "PMDG BAe JS4100.exe"
3. copy "PMDG_BAe_JS4100.DLL" to "C:\Program Files\Microsoft Games\Microsoft Flight Simulator X\Gauges" or whatever instalation path you have for the /Gauges folder
4. Launch a FSX flight using the plane you just installed then exit FSX 
5. Install "PMDG BAe JS4100 SP1.exe""
6. Go to  "C:\Program Files\Microsoft Games\Microsoft Flight Simulator X\SimObjects\Airplanes" and copy the entire folder named "PMDG_JS4100" to a diferent location
7. Uninstall the plane , start a flight with fsx, exit the sim then restart your PC
8. Repeat steps 2-4 then replace "C:\Program Files\Microsoft Games\Microsoft Flight Simulator X\SimObjects\Airplanes\PMDG_JS4100" with the folder you copyed earlier
9. Enjoy your flights !!!
 I`m using a cracked FSX with cracked Acceleration, under Win 7 ultimate, this may or may not work with other instalations but it worked fine for me. 
 P.S. i`m not looking for any kind of recognition, if you enjoyed the torrent leave some kind of feedback, or not, keep the flaming for yourself because i`ve already stated i`m not a coder, cracker or whatever, i`m just a dude who looked for a SP for this plane for ages now, and figured i could help others in my position. 
 Sorry if i`m double posting but i can`t find my original torrent anywhere....