From MCreator 1.7.8 on, there is not more such file. Now, you need to do the following. Go to your user home folder of the system you use. Here find the folder .mcreator. Go in it. You should find a file called preferences. If there is no such file, create one and give it no extension - the whole file name should be preferences.
If there is already a file, open it and look for the parameters "xms": and "xmx": and set them to the appropriate values. If there is no file, create one with the following contents:
Now all versions of mcreator (1.7.9 and below) are encountering gradle errors. I am running 32 bit 1.7.9 on a 64 bit computer, but this is because 64 bit keeps defecting. I have a zipped 64 bit file if it needs to be reviewed.
Check this issue for more information: https://mcreator.net/tracker/issue/40598
Another related issue: https://mcreator.net/tracker/issue/40566
Now all versions of mcreator (1.7.9 and below) are encountering gradle errors. I am running 32 bit 1.7.9 on a 64 bit computer, but this is because 64 bit keeps defecting. I have a zipped 64 bit file if it needs to be reviewed.