Have java 21 but MCreator still says i need it.

MCreator does not require you to manually install Java 21. Please see https://mcreator.net/install

If you see this message, it means your antivirus removed parts of MCreator that are essential for its operation. I recommend reporting false positive bug of your av

I have reinstalled Mcreator several times and offed the antivirus but it still shows that java runtime is required. what do i do

Something on your device prevents MCreator from installing all files, as if all files were present and accessible, this message would not be shown