If you install System 7.5 on your Macintosh Performa computer and it fails the installation, you may have a folder lock conflict.

Prior to System 7.5, the Macintosh Performa computers used a slightly modified version of System 7.x. One of the additional control panels is the Performa Control Panel. It provides folder protection by locking the folder so items cannot be accidentally removed. Only the System folder and the Application folder can be locked using the Performa control panel.

Before you can install System 7.5, you have to turn off System folder protection in the Performa control panel. Under System 7.5, you can turn System and application folder protection off and on using the General control panel.

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