How to get kaizo
Download the relevant patch files
The patch (.ips) files are not playable ROM files. They only contain all the differences between Kaizo and the original Super Mario World ROM.
Download the Super Mario World ROM
We won't post the original Super Mario World ROM on this site. If you Google it, you should find it.
Download a program to patch the ROM
Floating IPS is a good program for patching SNES ROM files.
Patch the ROM
Use Floating IPS to apply the patch (.ips) file to the original Super Mario World ROM file.
You are done! You should now have a file in .smc or .sfc format that is playable on an emulator or flash cart.