Apple Mac OS 7.6 - Manual (Page 11)

Step 4: Install the software
Click the fourth button to install Mac OS 7.6 and additional software.
WARNING PowerTalk is not compatible with Mac OS 7.6. Installing
Mac OS 7.6 disables PowerTalk. If you use PowerTalk, see “Installing
Over PowerTalk” in Chapter 3 before continuing with the
upgrade process.
11 Installing Mac OS 7.6
Click here.