Apple Mac OS 7.6 - Manual (Page 5)

Next, a screen appears describing the four steps in the upgrade process.
Step 1: Read important information
Click the first button to read about the upgrade process, as well as
compatibility and troubleshooting information.
Read the onscreen document that appears. Since the onscreen document was
written later than this book, it may contain additional information.
When you’re finished reading the document, choose Quit from the File menu
to return to the Install Mac OS screen.
5 Installing Mac OS 7.6
Click here.