hevron,
1) for JPSDR:
-default one in Staxrip releases is Clang W7 AVX to allow compatibility with older generation CPUs
-you can manually replace with Release tClang W7 AVX2 if you have a more recent processor (by recent I mean not older than 4-5 years approximately)
2) for AviSynth+, we use the 3.6xx fork, not the 2.x, get it here
https://github.com/AviSynth/AviSynthPlus/releases