Search the internet or go to a fellow Mac user. This is just one more good reason to belong to your local Macintosh User Group. You'll need Stuff It or Compact Pro if you plan to send large documents or pictures over the internet. Your recipient will be eternally grateful if your files are compressed. This is especially true when they pay an hourly rate for their internet access.
Time truly is money in their case.
It Lite and Compact Pro are shareware. You will frequently find them on demo disks or at web sites. Once you get the program, read the ReadMe or manual. I can also use it to compress large files and it will save them compacted across several disks. This is very handy when moving or backing up large HyperStudio Projects.