Every time I launch MCreator it gets stuck on "Loading MCreator Windows". I saw a similar problem someone else posted & have tried the following suggestions with no success.
Reboot
Uninstall (with the keep settings data checkmark unchecked )
Reboot
Install (without launching)
Reboot
launch
I also tried "going to <user home>/.mcreator and delete file called recentworkspaces" but there was no file there as I have never gotten the program open before.
Issue comments
This most likely happened because old version Java was still running in the background when you installed new version and some files were locked and were not replaced by new ones.
I recommend you reboot PC to release all file locks and reinstall the version again.
Nvm I fixed it. Running the bat file said that JNA native library 4.4.0 detected 5.1.0 expected. I downloaded the jar for it and replaced the 4.4.0 version in the lib folder & it successfully launched. Not sure why it had the wrong version. I uninstalled & reinstalled several times.