There’s now an experimental version of VapourSynth that support Python 3.12 and later. This means 3.13 and the 3.14 pre-release as well. Windows binaries can be found here. It’s safe to use and is apart from the better Python support identical to the R71 release.
If no major issues are found this will become the standard distribution method for the windows installer in future releases starting with R72.