How do I update FSX and which service packs do I need?
Use the correct FSX update path for boxed Standard, Deluxe, Acceleration, Gold or Steam Edition, with service-pack order and failure fixes.
To update Microsoft Flight Simulator X (FSX), first identify the edition. Boxed Standard or Deluxe without Acceleration needs Service Pack 1, then Service Pack 2. Boxed FSX with Acceleration uses Acceleration instead of standalone SP2. FSX: Steam Edition updates through Steam; never install the boxed service packs over it.
Which FSX update path should I use?
The correct FSX update path depends on the distribution and whether Acceleration is installed, not simply on whether the boxed simulator is Standard or Deluxe.
| What you own | Install in this order | Avoid |
|---|---|---|
| Boxed FSX Standard or Deluxe without Acceleration | Base FSX, SP1, then SP2 | Installing SP2 before SP1 |
| Boxed Standard or Deluxe with a separate Acceleration expansion | Base FSX, SP1, then Acceleration | Standalone SP2 after Acceleration |
| FSX Gold Edition | Install and run the base simulator, then install Acceleration from the Gold set; allow its setup to apply the required servicing | Adding downloaded SP1 or SP2 after Acceleration is installed |
| FSX: Steam Edition | Allow Steam to install and maintain the simulator | All boxed SP1, SP2 and Acceleration installers |
Does Microsoft Flight Simulator X Standard need Service Pack 1?
Yes, an unpatched boxed FSX Standard installation needs Service Pack 1 before standalone SP2. Boxed Deluxe follows the same order; its extra aircraft, scenery and SDK do not change the simulator service-pack path.
You can obtain the FSX SP1 download with boxed-install guidance. If you are not installing Acceleration, continue with our instructions for installing standalone SP2.
Is “FSX 2006” a separate version?
No. Microsoft Flight Simulator X was released in 2006, so “FSX 2006” normally means the original boxed simulator rather than a separate edition or patch. Check whether the package is Standard, Deluxe or Gold and whether Acceleration has been installed.
There is no yearly FSX upgrade path comparable to later Microsoft Flight Simulator releases. The SP1, SP2 and Acceleration branches apply specifically to the boxed FSX product.
Does Acceleration replace FSX Service Pack 2?
Yes, Acceleration replaces standalone SP2 in the boxed installation sequence, but the two products are not identical.
Acceleration installs a later FSX core and includes SP2-level fixes, along with additional aircraft, scenery and missions. An add-on that explicitly requires Acceleration may depend on that extra content and will not necessarily work with standalone SP2 alone.
For a separately purchased boxed expansion, the conservative sequence is FSX, SP1 and then Acceleration. Gold Edition is packaged to install the base simulator and Acceleration together, so separate service-pack downloads are normally unnecessary once its Acceleration setup has completed. Our modern-PC Acceleration installation procedure covers activation, prerequisites and protected Windows folders.
How do I install the boxed FSX updates correctly?
A clean base installation patched before third-party aircraft, scenery, gauges and utilities produces the fewest update failures.
- Confirm the edition. Determine whether FSX came from boxed media or Steam and whether you own Acceleration. Do not rely solely on the installation folder name, especially on a computer that has hosted more than one FSX edition.
- Back up modified files. Preserve
%APPDATA%\Microsoft\FSX\fsx.cfg,dll.xml,exe.xml, the scenery library configuration and any default aircraft or scenery files you have edited. A normal patch should preserve settings, but a repair or reinstall may not. - Install and run the base simulator. Complete activation, start FSX, load a flight with a default aircraft and close the simulator normally. This lets setup create its configuration and registry information.
- Install SP1. Close FSX and related utilities before running the installer. Use an administrator account, and approve elevated permission if Windows requests it. Start and close FSX once after SP1.
- Choose the final branch. Install standalone SP2 for Standard or Deluxe without Acceleration. If you own the separate Acceleration expansion, install it after SP1 and omit standalone SP2. With Gold Edition, use the supplied Acceleration setup and do not add SP2 afterwards.
- Test the core simulator. Load a default aircraft at a default airport before restoring add-ons. Reintroduce modules, gauges, AI traffic and scenery in stages so a compatibility problem can be traced to its source.
Standalone SP2 is not a cumulative replacement for SP1 on the plain boxed branch. Installing patches out of order is one of the most common reasons for an SP2 prerequisite error.
How do I update FSX: Steam Edition?
FSX: Steam Edition is updated and repaired through Steam, not with Microsoft’s boxed FSX service-pack installers.
Allow Steam to finish any pending download before launching the simulator. If core files are missing or damaged, use Verify integrity of game files. Back up modified default aircraft, gauges and scenery first because verification can replace altered files with the distributed versions.
Steam Edition already uses later FSX code and includes Acceleration-era content. Boxed SP1, SP2 and Acceleration setup programmes target a different installation and may either refuse to run or damage the Steam installation.
How can I check which FSX service pack is installed?
The build number shown by boxed FSX identifies its update level.
Press Alt if the menu bar is hidden, open the Help menu and view the About information. The principal boxed builds are:
10.0.60905.0— original unpatched FSX10.0.61355.0— Service Pack 110.0.61472.0— Service Pack 210.0.61637.0— Acceleration
Acceleration branding and its additional aircraft and missions provide another check. Do not compare Steam Edition directly with these boxed build numbers; let Steam manage that installation.
Do FSX updates refresh navdata and airports?
No. SP1, SP2 and Acceleration patch the simulator itself; they do not bring the default navigation database or every airport up to modern real-world standards.
The stock GPS uses FSX’s release-era navigation data, while many complex add-on aircraft maintain their own database. Airport layouts are a separate scenery matter: updating navigation data will not move a runway, change a taxiway or rebuild a terminal. See our explanation of how FSX navdata updates work before replacing any database files.
Is there an FSX Service Pack 3?
No official SP3 was released for boxed FSX. Acceleration is the last Microsoft boxed servicing branch, but it is an expansion rather than a package called SP3.
SDK service packs are only for developers using the Deluxe SDK, and their version must match the simulator. Downloaded replacement copies of fsx.exe, simconnect.dll or unrelated system DLLs are not general FSX updates.
What should I do when an FSX update fails?
Most failures are caused by the wrong installer, a missing prerequisite, damaged registration information or core files changed by an add-on.
- “FSX is not installed” or “product not found”: confirm that this is boxed FSX rather than Steam Edition. Run the base simulator once. If FSX was copied to another drive rather than installed there, or its registry information was removed, repair or reinstall it from the original media.
- SP2 reports a missing prerequisite: check the About screen and confirm that SP1 completed successfully. Do not apply standalone SP2 to Steam Edition or over an existing Acceleration installation.
- The installer rolls back or reports changed files: restore original core files or remove the add-on that replaced them. On a heavily modified installation, a clean reinstall followed by patching before add-ons is usually safer than replacing files individually.
- Windows reports access denied: close FSX and all related utilities, then run the correct boxed installer with elevated permission. Do not move an installed FSX folder manually as a workaround.
- FSX starts crashing after the update: test with a default aircraft and temporarily disable third-party modules. If necessary, rename the backed-up
fsx.cfgso FSX creates a fresh configuration, then restore settings selectively. - An add-on stops loading: check whether it was designed for SP2, Acceleration or Steam Edition. Those targets can have different executable, SimConnect and registry expectations even though all of them are called FSX.