Where to find the AVIsynth Proxy GUI

[Toner]

Hey guys,

I was trying to follow this tutorial on how to create a video from a still image and from an audio file.
https://www.avidemux.org/admWiki/doku.php?id=tutorial:create_video_from_still_image_and_from_audio_file

Instructions say:
Open AVIsynth Proxy GUI that is in your AVIdemux install folder.... just head to the AVIdemux install folder and start avsproxy_gui.exe

I had previously installed the Windows 64 version of Avidemux from an executable. 
I am not seeing this 'avsproxy_gui.exe' file in the program files or anywhere else. 

During the install process, there is an option to install Avisynth_VapourSynth package. 
Is that what I need to install?

[eumagga0x2a]

Presumably, no. At least Avidemux win64 builds packaged as ZIP include avsproxy_gui.exe in the top-most directory. Grab the latest.

[Toner]

Cheers, found it.