Apple Macintosh System 7.5 - Manual (Page 13)

Follow the instructions in this section to install the latest version of
Macintosh system software on your computer’s hard disk.
Step 1: Use the Safe Install Utility
To ensure a smooth upgrade to the new system software, it’s important that
you use the Safe Install Utility on the disk labeled
Before You Install.
The Safe Install Utility scans the System Folder on your computer’s hard disk
and identifies items that might be incompatible with System 7.5. Safe Install
checks startup programs (also known as extensions or control panels) for
compatibility. It does not check the compatibility of your application
programs.
With your computer turned on, follow these steps:
IMPORTANT If At Ease software is installed on your computer, you must turn
it off before you use Safe Install. For instructions, see the manual that came
with your At Ease software.
1 Insert the disk called Before You Install into a floppy disk drive. Then double-click the
disk’s icon to open it.
If you’re installing software from a CD: Open the Before You Install folder
(inside the Installation folder) on the CD.
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Installing System Software Version 7.5