The script's name (convert) conflicts with ImageMagick's convert. This lead's to imagemagick's convert overshadowing your convert function.

as of running the file, my paths get 100% screwed up and cmd/powershell can find it even though it still listed in my env paths

For anyone facing an issue, please take note of the following revised instructions.

Go to https://github.com/devanshkaloti/IDEProjectConverter-Java/tree/9d94a87368c5ac34f234fd4ed0a9649d87c778a3
Download that version (it's an older version before my friend added an install script and broke it, and if you follow the readme on that then it should work. I'm pretty sure you need python3 for my script.

Usually, users have to run my script, then the project is openable in Netbeans. From there, you can get netbeans to compile it, you may need to tell it where your src files are, resources are etc... My script works best for less complicated programs though (like school projects).

If my script still didn't work, then simply copy the "nbproject" folder from my project to your project. Then try opening it in netbeans, it should open!