Apple Macintosh System 7.5 - Manual (Page 47)

If you have already installed System 7.5 and your computer has enough
memory, you can install OpenDoc. For memory and processor guidelines, see
Chapter 1 (“Installing System Software”) of this book.
IMPORTANT Your upgrade kit comes with the basic OpenDoc software. To use
OpenDoc, you need applications or parts that use the OpenDoc technology.
Call your software manufacturer directly to see if they support OpenDoc.
IMPORTANT If At Ease software is installed on your computer, you must turn
it off before you install OpenDoc. For instructions, see the manual that came
with your At Ease software.
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Installing OpenDoc