Don't rename the files. From the product page: Product Installers PC You will need all three installers to install this product. Place them both in the same folder before running. The installer will reference the secondary and tertiary support files(.002, .003) on installation. PC Download Size: 34.00 Mb PC Part2 Download Size: 34.00 Mb PC Part3 Download Size: 0.39 Mb Product Installers MAC You will need both files to install this product. Place them both in the same folder before running. The installer will reference the secondary support file on installation Mac Download Size: 29.93 Mb Mac Part2 Download Size: 38.89 Mb *** Cheers!