Where do I get Visual Studio 15.4 that I need for pyTorch 0.4.1

I have a problem with the following dependency chain:

• MedicalDetectionToolkit (MDT) needs pyTorch 0.4.1 since in pyTorch 1.0 torch.utils.ffi is depricated
• pyTorch 0.4.1 needs CUDA 9.0 (does not work with 10.0)
• CUDA 9.0 does not work with Visual Studio > 15.4
• Visual Studio 15.4 is not available anywhere, the MSVS installer will install 15.9

The Visual Studio Installer allows to install the "Compiler Tools 15.4" side-by.side, but MDT uses torch.utils.ffi at some point, which just uses the 15.9.

So

How do I install Visual Studio 15.4?

Or

How do I tell torch.utils.ffi to use the 15.4 compiler?

(MedicalDetectionToolkit will not be updated by the author. I may try it, but would like to have a working version first.)

There are the "Build Tools for Visual Studio 2017 (version 15.0)" available on https://my.visualstudio.com/Downloads?q=Visual%20Studio%202017

You may first have to join the "Essentials" program. After joining the downloads became visible.