My problem
I installed pyside on python version 3.4 but I needed to change to a newer version I changed to 3.6 and it gave me the same error and now I am working on version 3.9 all are 32 bit.
I failed the PIP installation as you did, but I succeeded by downloading the PySide WHL package
You can search for PySide here, see which versions are currently supported, and install via PIP install XX.whl