With a release of DCS 2.5.5.41371.1 all products are keyless.
https://www.digitalcombatsimulator.com/en/news/changelog/stable/2.5.5.41371.1/
Your successful order in E-shop means that you have access to this module.
It's important to be logged with your account to DCS World game.
You no longer need to use deactivation before changing computer hardware.
You can check your Licenses at the page My licenses
More information about new keys system here:
https://forums.eagle.ru/showthread.php?t=196585
You can find all information about your orders and keys on this page:
http://www.digitalcombatsimulator.com/en/personal/order/
Click to "details".
You can check your Licenses on the page My licenses
The Automatic Activation method is the preferred method; an Internet connection is necessary.
Install the game to your computer. Launch it and fly a mission. The Activation window will be displayed. Please follow the directions.
Enter your Activation Number which is printed on the DVD Quick Start Guide sticker or was provided to you via e-mail from E-shop. Press the Next button.
The Automatic Activation is now complete.
An activation Guide can be found in the local folder ..\Eagle Dynamics\DCS World\Doc\DCS World Activation Guide EN.pdf
and the same file on DCS site: DCS World Activation Guide EN
You can try to solve this error ...
1. If you are using user mods Reshade/SweetFX, please remove it.
If you have this message: The Activation Key is not valid any more due to significant changes of the computer Hardware configuration (Invalid Hardware Code), or Unable to run the application due to integrity fault of the Activation Key.
Also the error can appear in different instances and not just hardware changes. For example, in case of the common DCS World update with MiG-21 module
These reg files can help you if you did an upgrade of PC without correct procedure of de-activation of the serial number and all other instances of this error.
You should use it whenever you have an issue with activation.
You have to download reg file for affected module (you can use Save Link As ... option).
Please run the reg file it will delete old (wrong) information about activation from your Windows registry.
Then please try to activate your product again.
Registry fixes for modules:
Registry fixes for campaigns:
Here is an example for MiG-21 keys:
run Regedit command and manually delete all the entries under the DCS:MIG-21Bis\Keys node.
Please find the entry not only under hkey_local_machine but also under current_user subtree too.
You have to delete the Keys node manually from BOTH subtrees:
HKEY_LOCAL_MACHINE\SOFTWARE\Leatherneck Simulations\DCS:MIG-21Bis
HKEY_CURRENT_USER\SOFTWARE\Leatherneck Simulations\DCS:MIG-21Bis
How to use Regedit (you can Google it) :
http://www.techsupportalert.com/content/learn-how-use-windows-registry-editor-regedit-one-easy-lesson.htm