Making them is just the same as the later engines, but you are working with 3x3 tiles rather than 2x2. Set your grid to 16x16 to divide the tiles in half. The 16 pixels right around the outside are your edge pieces. The middle 32x32 tiles are what repeats.
Hi regarding the 32 bit -> 64 bit
I am running on a 64 bit windows OS and tried doing this conversion. I converted all of the .exe files that I could find in the KADOKAWA\RPGMV folder using the 4gbpatch.exe file. However, after trying to access RPG Maker MV after this conversion, it simply will not load. Do you have any advice or any ideas?