[2022] A serious bug after disabling directx 10

I'm not sure what you are reporting...  Warframe's support for DirectX 10 ended last year. When you click "Settings" in the launcher, what is the "Graphics API" set to?

We're investigating this. You should not be required to Windows 10, this seems like just a problem with the Launcher's ability to detect your system's DirectX level.

Update:
We identified the problem and added a workaround to the launcher for the next hotfix.  However, please be aware that at least for some machines we can confirm that this problem is a result of not using Windows Update to install official OS patches. We encourage everybody using Windows PCs to stay up to date.

Edited 20 hours ago by [DE]Momaw