THINK Reference is a commercial suite of products. These products can be purchased on the MacTech CD ROM. Free updates to these products may be available and if so are listed below. Updates that require a previous version to install require the file exactly as it appears on the release CD ROM. We recommend you re-install the previous version from the release CD ROM before attempting to run the updater. Updates are available by ftp from FTP://ftp.mactech.com/thinkref/.