Flight Simulator 2004 Update v9.1

The Microsoft Flight Simulator Team is pleased to announce a product update for Microsoft Flight Simulator 2004: A Century of Flight. In response to customer feedback and Product Support information, the Update will address a series of enhancements and content updates.

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26.79 MB
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Scanned 22 days ago (clean)
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Free (Freeware)
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5 star rating.

Rated 5 out of 5 stars by 5 PRO members.

The Microsoft Flight Simulator Team is pleased to announce a product update for Microsoft Flight Simulator 2004: A Century of Flight. In response to customer feedback and Product Support information, the Update will address a series of enhancements and content updates.

Update Enhancements

  • Addressed slow frame rates for flights repeatedly in and out of a common area. Frame rate decreases have been corrected by fixes to Autogen scenery behavior and memory allocation.
  • Addressed product stability issues that were due to changes of season in particular airport environments. Users will experience stable and consistent behavior when changing the time and season across any of the airports at any level of scenery detail.
  • Addressed additional product stability issues tied to various features throughout the product.
  • Addressed issues with configuration file updates to make sure all option changes are reflected during subsequent launches.
  • Restored support for 19 meter digital elevation data as was supported in Flight Simulator 2002.

Content Updates

  • The update includes over 160 bridge models to replace missing bridges. These new bridges will appear at all scenery settings of normal and higher.
  • Kennedy Airport (KJFK) features new autogen objects to enhance the high detailed scenery and terrain for the airport and surrounding area.
  • Virtual Student Pilots completing their first solo flights will correctly receive Solo Certificates for their accomplishments.
  • The update is available for the English, Deutsch, Français, Italiano, Español, and Japanese editions.


1. Download and save the Update file fs91upd.exe to your Flight Simulator 2004 directory. (For example, C:Program FilesMicrosoft GamesFlight Simulator 9.)
2. Double-click the Update icon and follow the instructions on the screen.
3. When installation is complete, you'll get a message stating the update was successful.

Additional Information

To determine if you need the Microsoft® Flight Simulator 2004: A Century of Flight (UPDATE):

1. Run Flight Simulator 2004.
2. Click Fly Now!
3. Press ALT to display the menu bar.
4. Click About Microsoft Flight Simulator on the Help menu.
5. Check the version number in the About Microsoft Flight Simulator dialog box. If the version number is 9.0 we recommend installing the update.

After updating, the version number for Flight Simulator 2004 will be 9.1.


This simple little add-on update for FS2004 was something that I never actually bothered installing until it as way too late. It was a silly move to make as it helps to make a lot of changes and additions to FS2004 that, if I had used them in the past, would have really enhanced my user experience.

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Whether you still use FS2004 regularly or it’s just something that you like to mess around with, you’ll find that this FS2004 update – version 9.1 – is well worth taking into account. It will really help to stabilize performance, but it brings a wealth of new features to the table and makes things stand out in that regard, as well.

This was released in response to customer feedback and I have to say they seem to have done a pretty comprehensive job in patching up a lot of the problems that we used to face. For example, you should notice that v9.1 corrects issues such as;

  • A lack of support for 19m digital elevation data which was supported in FS2002 but was since removed. This add its back in, which is a more than timely addition that many flight simulation fans will be delighted to see return
  • Much better overall performance levels and stability that have been included due to a raft of changes – in particular with regards to how airports manage themselves. Now, you should notice a far more stable level of performance when you head into an airport regardless of the scenery and/or the season
  • Addressed various config file problems that makes sure all option changes are picked up prior to launching the software again
  • Ensuring that general consistency and performance was improved, with better stability when using various new FS2004 features that were, at the time of release, extremely raw
  • FPS improvements to ensure that you get a more consistent level of performance as you fly, making sure that autogen no longer eats up your memory quite so much

However, it also brings in various additions to the table which I was very impressed by. By installing this, you get;

  • More than 160 missing bridge models are finally added, ensuring that the world has much greater variety to it than it had previously. This makes the whole place feel far more realistic than it once did, bringing the entire location to life
  • The Kennedy Airport comes with new autogen objects included to make sure the whole place looks the way that it should, with detail scenery and terrain across the airport and the nearby areas
  • Any pilots can now receive their Solo Certification’s when taking on Virtual Student pilot courses, which was something that was sorely lacking from the original release

This is a very simple update and only take a matter of seconds to install, but it changes so many little things it would be madness not to install it. If you still use FS2004 and enjoy the service, I really do recommend that you check this out as soon as you can.

Adam McEnroe

Adam McEnroe

Adam McEnroe is a flight sim enthusiast who has been simming since the days of FS95. Adam writes all of the download section editorials after testing each of the files. Adam has extensive knowledge using various flight simulator packages and thoroughly tests the files before writing about them. Adam also like to fly real-world aircraft in his spare time and is training for his PPL.

Should you wish, you can contact Adam via email at adam@flyawaysimulation.com.

Installation icon.

Installation Instructions

Most of the freeware add-on aircraft and scenery packages in our file library come with easy installation instructions which you can read above in the file description. For further installation help, please see our Flight School for our full range of tutorials or view the README file contained within the download. If in doubt, you may also ask a question or view existing answers in our dedicated Q&A forum.


Leave a Response

The content of the comments below are entirely the opinions of the individual posting the comment and do not always reflect the views of Fly Away Simulation. We moderate all comments manually before they are approved.

alexandre tsakirisTue, 15 Mar 2022 17:09:09 GMT


Hello, I have an atc.dll error that prevents me from updating fs9 under w10. how to do it. cordially.

LaurieSat, 16 Jan 2021 23:31:48 GMT

Could not download a patch from your site to help with my flight sim 2004 message that comes up in type 18? Seems like a crazy amount of things to do and try and get this old program to run. thank you. L.

Dan HallWed, 23 Dec 2020 14:14:58 GMT

The download and install worked perfectly as the instructions indicated. Very nice when something actually works as it should. Thanks for the update.

John MerrileesFri, 13 Dec 2019 00:40:53 GMT

Since Flight Simulator 2004: a Century of Flight, which I have had for at least 9 years, and which keeps asking for Administrator Permissions (WINDOWS 10), when I am the SOLE Administrator, HAS NOW DECIDED, after running Happily on WINDOWS 8.1, TO DO THE SAME, can you tell how to stop this, stopping me from running the game, before I write it off as incompatible (your troubleshooter is worse than useless) and scrap it.

BRADMEALSFri, 15 Nov 2019 22:24:05 GMT

Can not get the fs9.exe file to download... help?

Benoit SIMARDTue, 19 Feb 2019 20:28:38 GMT

Very nice descriptions for going BACK to FS

KAKAL MAKBOULSat, 29 Oct 2016 12:49:42 GMT

I use windows 10, and I have FS 2004.but its not working .So I downloaded fs9.1 and a pacht No-CD.And save it to fs 2004 file. But I could not update successful. The message the file ATC.DLL is modified or deplaced is coming . So what to do

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