HeadsUp: Might drop linux support,...

[Selur]

For debian based systems https://github.com/Selur/hybrid-vapoursynth-addon should allow to build and install Vapoursynth and plugins.
Alternatively you can install Vapoursynth and plugins manually and use misc.ini ([INFO] *hidden* Hybrid options,...) to tell Hybrid that Vapoursynth should be enabled.

Cu Selur

Ps.: https://forum.doom9.org/showthread.php?t=182032 lists the currently for Avisynth+ on Linux available filters (aside from the functions that directly come with Avisynth).