Edit: Initially I wrote an unproductive rant, but instead I'll just say that I think it might be helpful to have that alternative method of installing the neccessary files such as Vapoursynth on the existing Python setup that's already on the user's system, if such a thing is detected.
It could save some headaches.
SVPlayer for 🍎 iPhone | iPad | Apple TV and 🤖 Android
SVP 4 for Windows and macOS: 30 days FREE TRIAL.
Read FAQ & follow SVP @ Facebook, Twitter