Apple Macintosh System 7.5 - Manual (Page 25)

If you have already installed System 7.5 and your computer has enough
memory, you can install QuickDraw GX. For memory and processor
guidelines, see Chapter 1 (“Installing System Software”) of this book. For
more information on QuickDraw GX features, see Chapter 6 (“What’s New”)
later in this book.
Step 1: Install QuickDraw GX software
IMPORTANT If At Ease software is installed on your computer, you must turn
it off before you install QuickDraw GX. For instructions, see the manual that
came with your At Ease software.
IMPORTANT QuickDraw GX installs GX printer drivers for Apple printers. If
you use a non-Apple printer, you may need to get the appropriate printer
driver from the vendor.
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Installing QuickDraw GX