Installing Nvidia FleX for UE4

Development Getting Started & Setup
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Hello

I’m trying to install Nvidia FleX for ue4.

here is the readme file:

1. Install **[GitHub for Windows](https://windows.github.com/)** then **[fork and clone our repository](https://guides.github.com/activities/forking/)**. To use Git from the command line, see the [Setting up Git](https://help.github.com/articles/set-up-git/) and [Fork a Repo](https://help.github.com/articles/fork-a-repo/) articles.

If you’d prefer not to use Git, you can get the source with the ‘Download ZIP’ button on the right. The built-in Windows zip utility will mark the contents of zip files
downloaded from the Internet as unsafe to execute, so right-click the zip file and select ‘Properties…’ and ‘Unblock’ before decompressing it. Third-party zip utilities don’t normally do this.

  1. Install Visual Studio 2015.
    All desktop editions of Visual Studio 2015 can build UE4, including Visual Studio Community 2015, which is free for small teams and individual developers.
    Be sure to include C++ support as part of the install, which is disabled by default.

  2. Open your source folder in Explorer and run Setup.bat.
    This will download binary content for the engine, as well as installing prerequisites and setting up Unreal file associations.
    On Windows 8, a warning from SmartScreen may appear. Click “More info”, then “Run anyway” to continue.

    A clean download of the engine binaries is currently 3-4gb, which may take some time to complete.
    Subsequent checkouts only require incremental downloads and will be much quicker.

  3. Run GenerateProjectFiles.bat to create project files for the engine. It should take less than a minute to complete.

  4. Load the project into Visual Studio by double-clicking on the UE4.sln file. Set your solution configuration to Development Editor and your solution
    platform to Win64, then right click on the UE4 target and select Build. It may take anywhere between 10 and 40 minutes to finish compiling, depending on your system specs.

  5. After compiling finishes, you can load the editor from Visual Studio by setting your startup project to UE4 and pressing F5 to debug.

First I cloned the project from Github and completed the setup.bat file.
but in GenerateProjectFiles.bat I got an error that says the visual studio is not installed on my system.
Error text:
GenerateProjectFiles ERROR: We couldn't find a valid installation of Visual Studio.  This program requires Visual Studio 2015.  Please check that you have Visual Studio installed, then verify that the HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\14.0\InstallDir (or HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\14.0\InstallDir on 32-bit machines) registry value is set.  Visual Studio configures this value when it is installed, and this program expects it to be set to the '\Common7\IDE\' sub-folder under a valid Visual Studio installation directory.

Press any key to continue . . .


Though I have the last version of visual studio(community)2019 and all C++ prerequisites (I installed it on drive E, not in windows drive(C)).

But I don’t have the registry key that the error shows me.