When I try to run ANY mod of Powder Toy, I get this error- Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 0
Dyld Error Message: Library not loaded: /usr/local/lib/libSDL-1.2.0.dylib Referenced from: /Users/macbook/Downloads/Gameerboy8864's Mod 2.app/Contents/MacOS/powder-x Reason: image not found
Looks like your SDL isn't installed properly or it have been linked wrong, if you go to the folder /usr/lib can you find that file? If so, copy it to /usr/local/lib.
Go to the folder /usr/lib (Just like /WINDOWS/system32 in Windows. I think Macs use Finder as a file browser, though I'm not sure. Do you see SDL installer there? If you do, copy it and paste it in the directory /usr/local/lib.