Apple Macintosh System 7.5 - Manual (Page 15)

Step 3: Use the Installer
To install the new software, follow these steps:
1 Quit any open application programs or desk accessories.
2 Insert Install Disk 1 into a floppy disk drive or open the System Install folder on the
Macintosh System 7.5 Group Upgrade CD.
3 Open the System Install icon.
4 When you see the Installer’s welcome screen, click Continue.
The Easy Install dialog box appears.
Installing a customized system: These instructions cover the Easy Install
process, which is suitable for most Macintosh and PowerBook users. For
information about the Custom Install option, see the Macintosh System 7.5
Upgrade Guide.
WARNING You cannot install System 7.5 or its components by dragging
the system software to your disk. You must use the Installer. All files are
compressed. The Installer expands them.
11 Upgrading Your Own Macintosh or PowerBook