Uninstalling/Deactivating Prepar3D

Any issues, problems or troubleshooting topics related to installing the Prepar3D client application or it's installer.
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Uninstalling/Deactivating Prepar3D

Postby Poppet » Sun Jun 11, 2017 4:14 pm


A Step by Step guide to Uninstall Lockheed Martin's Prepar3D v4

By following this process you will Deactivate and Uninstall Prepar3D v4 from your Computer.

Please Note: Follow this link for a Tutorial to Uninstall Prepar3D v3


Updated Link 08 \ 2018

I have now Included a Video Tutorial to Uninstall and Deactivate Prepar3D v4 at the link below




1)  Uninstalling Prepar3D v4 

2)  Deleting the 6 Prepar3D v4 folders


* Additional Information
  • Returning Prepar3D v4 to a default state


1)  Uninstalling Prepar3D v4 

Navigate to your Control Panel  "programs and features"  Right Click on  Prepar3D v4 Academic \ Professional  Click Uninstall 


The Modify Setup box will appear, Click Uninstall


After this process has completed,  Click Close 


Please Note: If you originally Installed Prepar3D v4 by running the component Installers Individually you will not have a Prepar3D v4 Academic \ Professional in your Control Panel

You can just Right Click on each of the components Client, Content and Scenery and Uninstall each one of them


2)  Deleting the 6 Prepar3D v4 folders 

While the uninstaller removes all files that are created by the installer, it does not completely remove content that was generated during program execution. To completely uninstall Prepar3D, you must manually delete folders and files that are created during runtime.

Note: To locate these folders, Insure the box is Ticked for  Show hidden files, folders and drives in File Explorer Options

For a Clean Uninstall, please manually delete the following 6 blue folders:


Local Disk (C:) ► Program Files ► Lockheed Martin ► Prepar3D v4  (or the modified install location)

Documents ► Prepar3D v4 files \ Prepar3D v4 Add-ons

Local Disk (C:) ► ProgramData ► Lockheed Martin ► Prepar3D v4 

Local Disk (C:) ► Users ► You ► AppData ► Roaming ► Lockheed Martin ► Prepar3D v4

Local Disk (C:) ► Users ► You ► AppData ► Local ► Lockheed Martin ► Prepar3D v4


Restart your computer, You have now successfully uninstalled\Deactivated Prepar3D v4

You are now ready to Reinstall again


* Additional information
  • Returning Prepar3D v4 to a default state

If you are Uninstalling Prepar3D v4 to fix an Issue you are having maybe you could run a Repair and also delete the generated files to see if this solves your Issue

By following the 2 steps below you will bring Prepar3D v4 back to a default state again, After you complete these steps, Launch Prepar3D and test 

2 Steps to return Prepar3D v4 back to a default state

Step 1:  Run a Repair

Navigate to your Control Panel  "programs and features"  Right Click on  Prepar3D v4 Academic \ Professional  Click Change


The Modify Setup box will appear,  Click Repair When the process has completed Restart your computer


Step 2:  Delete the Generated Files 

There is a file located in your Core Prepar3D v4 folder called Delete Generated Files,  by double left clicking on this file the generated content from the 3 Prepar3D v4 folders in ProgramData, Local and Roaming will be removed

Note: This process will disconnect your Add On's and all previously saved settings.  

When you launch Prepar3D these files and folders will generated again as default.  

Navigate to your core Prepar3D v4 folder,  Scroll down a bit,  Double left Click on the file  Delete Generated Files 

Please see this link for a short video https://youtu.be/YsOibqIV0OQ


By successfully following these 2 steps Prepar3D v4 will now be at a Default state  

Launch Prepar3D and test to see if this has resolved your Issue.

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