On Windows unzip the file by using...
- the "Extract..." command in Windows Explorer, by right-clicking on the file,
- or 7-zip from here,
- or WinRAR from here,
- or Winzip from here,
- or PKzip from here.
On Linux and UNIX systems use...
- the built-in 'unzip' command in the install directory as :
unzip chkr_install_x.xx.zip
(with x.xx the release number. Get the unzip program here if it's missing.),
- or p7zip from here (A Linux port of 7-zip),
- or PKzip from here.