[atmosfear]

Originally Posted by arnaud401    Here is the tutorial for MAC users  4 simple steps 1/ Download the fix 2/ unZip it in the BCES01175 folder 3/ Install Macports : -Lion: https://distfiles.macports.org/MacPo...-10.7-Lion.dmg -Snow Leopard: https://distfiles.macports.org/MacPo...nowLeopard.dmg -Leopard: https://distfiles.macports.org/MacPo....5-Leopard.dmg 4/ Once Macports installed, just launch "uc3_fix_unix.command" You are done! Hope this helped!

You missed a bit. Before installing macports, make sure you have Apple Xcode installed, download it from the mac app store or apple home page fro free.
After you installed macports, open a terminal window and enter "sudo port install xdelta" to install the xdelta3 utility needed for patching the .psarc files.