YOU NEED NODE.JS TO USE IT!

Tutorial:

download it
drag the cape, background for cape render, background for elytra render and skin to assets folder, and rename them like this:

background (cape) - backgroundcape.png
background (elytra) - backgroundelytra.png
cape - cape.png
skin - skin.png

run setup.bat
that should create start.bat, run it
enjoy

Info:

original: https://github.com/FelixmaxYT/Cape-Render-dingus

if you want to use it, go ahead you dont need to even give credit

if you need any help, you can find my socials here: https://grosik.ovh/