I just downloaded the libtorch package from https://download.pytorch.org/libtorch/nightly/cu90/libtorch-win-shared-with-deps-latest.zip 2 and when unzipping I find torch.h in libtorch/include/torch/csrc/api/include/torch/torch.h. You have to set your include path to libtorch/include/torch/csrc/api/include/ or just use our CMake.