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 your serial numbers in the order details at the Orders page, at the product page in the E-Shop and in the Module Manager in the game.
You can find and check your Licenses on the page My licenses
In case of bundle products (the combined package from special offer) you can find a serial numbers at the individual product page in E-Shop, click a button to reveal it - provided that you're logged in.
For example, serial numbers can be found on specific product E-shop pages:
Nevada is here:
https://www.digitalcombatsimulator.com/en/shop/terrains/nttr_terrain/
A-10C Warthog is here:
https://www.digitalcombatsimulator.com/en/shop/modules/dcs_a10c_warthog/
and so on, please use site search.
Important!
All the modules purchased in E-shop after 13 April 2020 have No serial number because of the new protection system. Your successful order in E-shop means that you have access to this module.
It will works only during successful DCS log in.