[LouieChuckyMerry]

Originally Posted by Zathor

Also avs+ needs the vcredist 2017 which you do not have installed. It should be copied by MeGUI but could you please try to install:
https://aka.ms/vs/15/release/vc_redist.x86.exe

Happy Friday! I've downloaded and installed the above 2017 vcredist.

Originally Posted by Zathor

OK, what is happening is that that avisynth.dll cannot be used by MeGUI. Therefore the script calls the system installed dll which is the old AviSynth from 2015.
The question therefore is why the avisynth.dll in the MeGUI folder is not autoloaded. How do you start MeGUI? With a double click on the MeGUI.exe?

I've portable MeGUI in a folder on a RAMDisc and pinned to the Win 7 64 bit start menu. I tried double-clicking on MeGUI.exe but receive the same "No Function Prefetch" error, so it seems to still be reverting to the installed 2015 avisynth.dll.