Install Python 3 as WSH engine

I would like to install ActivePython 3.6.0.3600 as Windows Scripting Host engine (to use in classic ASP).

I've found instructions on how to do that for Python 2 at https://stackoverflow.com/questions/7637210/getting-activepython-to-work..., but I don't know how to apply them for Python 3.

I tried to run ca_pywin32reg.pyw, but it fails with syntax errors.

How do I install Python as a WSH engine?