The files you download from us are compressed as ".RAR" files. These are very similar to .ZIP files, but sometimes require a separate program to extract/open. If you use a Mac/OSX, we recommend using "The Unarchiver" - DOWNLOAD HEREOn Windows, you should be able to double-click and extract without the need for additional software. However, some users prefer to use 7-zip or WinRar for handling compressed files.