@Bumbleguppy I don't know if you have figured it out since then.
Basically here there are two releases :
https://github.com/epinter/tq-mapdecompiler/releases
Use the link at the bottom (v0.1), not the top link v0.1.1 which is bugged. Download mapdecompiler.7z from v0.1 on December 5th, 2021.
https://imgur.com/B5oHpCF

I had a dll error (ucrtbased.dll) solved with
https://fr.dll-files.com/ucrtbased.dll.html
Put 32 bits version in C:\Windows\System32   and/or 64 bits version in C:\Windows\SysWOW64

The correct command is:           mapdecompiler.exe world01.map world01.wrl
Writing ".exe" seems necessary.

EDIT: I solved it.

(((I tried this method (and also got the ucrtbased.dll error, which I got rid off with your fix), but I am still getting another Error after putting the command line:
VCRUNTIME140D.dll could not be found.

After a google search, I tried to fix it by installing Visual C++ Redistributable for Visual Studio to see if that solves the problem, but I still get the error message.

Can anyone help me with that?)))