Tried running pip3 install torch===1.4.0 torchvision===0.5.0 -f https://download.pytorch.org/whl/torch_stable.html first, taken from PyTorch website
which resulted in
No matching distribution found for torch===1.4.0
and Could not find a version that satisfies the requirement torch===1.4.0 (from versions: 0.1.2, 0.1.2.post1, 0.1.2.post2)
Finally downloaded the .whl file from downloads page and tried installing locally like so 'C:\Users\Raf\AppData\Local\Programs\Python\Python38\Scripts\pip.exe' install torch-1.4.0+cpu-cp37-cp37m-win_amd64.whl
after which I get torch-1.4.0+cpu-cp37-cp37m-win_amd64.whl is not a supported wheel on this platform.
using 64 Python 3.8, on 64 bit Windows
using 64 Python 3.8
but you downloaded the cp37 whl which is for python 3.7. There is currently no whl file available for python 3.8. So either install from source (probably not recommended), install a different python version or create a virtual environment with python 3.7
Update
There is now: https://download.pytorch.org/whl/cpu/torch-1.4.0%2Bcpu-cp38-cp38-win_amd64.whl