I am looking for the direct download of the TensorRT Python API (8.0/latest) wheel file to install it with a version of python3 different from the system/OS included one. According to Support Matrix :: NVIDIA Deep Learning TensorRT Documentation,
Note: Python versions supported when using Debian or RPM packages. When using Python wheel files, versions 3.5, 3.6, 3.7, 3.8, and 3.9 are supported.
Python wheel files won’t be available. You need to install one of required python versions separately. Based on your OS version and CUDA version download and install appropriate TensorRT deb/tar package. Following doc will be helpful for the installation