Pytorch==1.6.0 installation error

I upgrade my cuda version to 8.0 and I try to using pip to install torch==1.6.0 . According to official command
I would get error:
ERROR: Could not find a version that satisfies the requirement torch==1.6.0 (from versions: none)
ERROR: No matching distribution found for torch==1.6.0
WARNING: You are using pip version 21.1.2; however, version 21.3.1 is available.
You should consider upgrading via the ‘D:\torch_pypi\venv\Scripts\python.exe -m pip install --upgrade pip’ command.