This version of DLSS is a higher version number than the one included with Rainbow Six Siege (although the modified date seems older than 2.2.6.0..?) - still, it's newer than the ones included with Metro Exodus and Doom Eternal and it's available directly from Nvidia here:
https://developer.nvidia.com/dlss/unreal-engine-plugin
Download the UE4 archive and you'll find it in 06172021-DLSS-UE4-Plugin\DLSS\Binaries\ThirdParty\Win64
Works great in Doom Eternal!
https://developer.nvidia.com/dlss/unreal-engine-plugin
Download the UE4 archive and you'll find it in 06172021-DLSS-UE4-Plugin\DLSS\Binaries\ThirdParty\Win64
Works great in Doom Eternal!