Nvida Flex project build failed, missing UE4-Flex.lib

I have a custom 4.19.2 version of UE4 with Nvidia Flex running fine in editor and when simulating gameplay. When I try to make a build, I believe it fails at the following line “ERROR: UBT ERROR: Failed to produce item: C:\Users\Admin\Downloads\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Binaries\Win64\UE4-Flex.lib” I have searched far and wide for the UE4-Flex.lib file, but have not found it anywhere.

Instructions on how to resolve this used to be here but the repo has been taken down https://github.com/NvPhysX/UnrealEngine/pull/523

Any help would be greatly appreciated. My project is at a standstill until I can get this library. I attached some logs in case they are any help.

UnrealBuildTool-2023.04.18-16.18.22.txt (2.7 KB)
UAT_Log.txt (41.5 KB)