If there are any rar. files in the downloads, they need to be changed to a zip folder that has the mod in it, because I can't find a way to use the rar with any program to open it.
This one is totaly free and open anything
http://www.pchealthdoc.com/software/unzip.html (http://www.pchealthdoc.com/software/unzip.html)
also free
http://www.clubic.com/telecharger-fiche11161-7-zip.html (http://www.clubic.com/telecharger-fiche11161-7-zip.html)
It supports read formats ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR et Z.
For archive creation, it is limited to 7z, XZ, BZIP2, GZIP, TAR, ZIP et WIM.