Microsoft Flight Simulator FAQ

Search for answers to your questions by entering keywords below, or look through our knowledge base.

All versions - Packages installation & decompressing issues - Basic troubleshooting


Packages installation and decompressing issues can be caused by software or hardware. The following troubleshooting steps are particularly useful if you're experiencing the following issues:

  • Download "loops" on the same package
  • The download stops 
  • Download speed drops too low





  • Close the sim
  • Navigate to the Package installation folder
  • Delete the packages currently stuck
  • Reboot the computer
  • Relaunch the sim and try again



  • Sample of Virus & malware checkers that have been known to prevent Microsoft Flight Simulator from updating or launching:
    • BitDefender
    • Malwarebytes
    • Trend Micro Maximum Security
    • Comodo Antivirus
    • Sophos
    • Emisoft Anti-Malware
    • Avira
    • Avast & Avast Cleanup
    • Bullguard
    • Kasperky

Open Windows Defender and turn off real-time protection.

  • In the Cortana search box, type "Windows Security"
  • Open "Windows Security" > "Virus & Threat protection" > "Manage settings"
  • Disable "Real-time protection"

Stop Windows Defender from blocking Microsoft Flight Simulator by adding the launcher to the exclusions list

  • Go to Start  > Settings  > Update & Security  > Windows Security > Virus & threat protection.
  • Under Virus & threat protection settings, select Manage settings, and then under Exclusions, select Add or remove exclusions.
  • Select Add an exclusion, and then select Microsoft Flight Simulator. A folder exclusion will apply to all subfolders within the folder as well.

Temporarily disable your security program(s) before launching Microsoft Flight Simulator

False positives occur when your antivirus software incorrectly identifies safe software as malicious. If your antivirus or anti-malware falsely flagged Microsoft Flight Simulator remove the file from quarantine if necessary then whitelist Microsoft Flight Simulator. To do so follow the instructions from your manufacturer.



Make sure there is enough space on the hard drive to decompress the files. If you download 15 GiB of data, you need about 30 GiB of free space on the disc.



  1. Right-click on the “Network  / Wi-Fi ” icon on the bottom right corner of your screen to open up the menu shown below.
  2. Click on Open Network and Sharing Center.
  3. In the Network and Sharing Center window, click on Change adapter options. 
  4. You will then see a list of network adapters available on your computer.
  5. Right-click on your active network adapter (Ethernet or Wi-Fi) and select Properties.
  6. In the Properties window, scroll down until you see Internet Protocol Version 6 (TCP/IPv6)
    Note: If you’re connected to the internet wirelessly, the corresponding adapter should be “Wi-Fi“. However, if you’re connected to the internet via a LAN cable instead, the corresponding adapter should be “Ethernet“.
  7. Uncheck the Internet Protocol Version 6 (TCP/IPv6) checkbox and click on OK to save the changes.

Now that IPv6 has been disabled on your computer, reboot your computer for the setting to take effect.

Note: If you do not see a significant improvement, we recommend enabling IPv6.



Allocate more resources to the task. Close any unnecessary background applications and web pages, and disable any overlays (Steam, Discord, etc). Close the launcher, wait a few minutes, then try again.



The download will pause when your primary, secondary, or external hard disk drive goes to sleep. Make sure that your hard drive doesn't go into sleep mode, thus preventing the data to be written on the drive.



Memory errors can cause issues with the installation process. To investigate possible issues with your system memory, please do the following:

  • Close all applications on your computer
  • In the "type here to search" bar, next to the Start menu type "Memory Diagnostic"
  • Click on "Restart now and check for problems"
  • Wait for the tool to finish running the diagnostic


Alternatively, you can use memory testing software such as

Was this article helpful?
12 out of 137 found this helpful