Ensure you are applying the SP 2.20 patch specifically designed for your sim version. Some "Fixed" versions in the community also include updated .air files for better landing flare physics.
After digging through old backups and forum archives, I can confirm that is the definitive final patch for the FS2004 version. Here’s what you need to know: fsx fs2004 flight1 fokker 70 100 service pack 2 20 fixed
FSX standard : C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\ FSX Steam Edition : ...\Steam\steamapps\common\FSX\ Ensure you are applying the SP 2