You only need to download an Acrobat file if you do not have Word 97 on your computer. If you are using an RM Primary Network or SchoolShare system, you do not need an Acrobat file - download a ZIP or Word 97 file instead.
If you need an Acrobat file, you also need the Adobe Acrobat Reader, which can be obtained free of charge from Adobe's web site. The reader will let you open, read and print the file, but not edit it.