The System 7.5 Update 1.0 includes PC Setup control panel version 1.0.2, which is older than the PC Setup control panel that came with Macintosh DOS Compatible computers.
If you choose the Custom Install option for the Macintosh DOS Compatible when you run the System 7.5 Update 1.0 Installer, your newer version of the PC Setup control panel is replaced. The Easy Install option leaves the newer version in your system untouched.
Older Control Panel Not Compatible
PC Setup Control Panel version 1.0.2 is not compatible with the Power Macintosh 6100, Macintosh LC 630, or Performa 640 DOS Compatible computers. The Macintosh Quadra 610 DOS Compatible, however, works fine with PC Setup Control Panel 1.0.2 or earlier, so installing the System 7.5 Update 1.0 on this computer has no affect on compatibility of the PC Setup control panel.
Reinstalling the System 7.5 Update
If you need to reinstall System 7.5 Update 1.0, please note the following installation order. To avoid reinstalling PC Setup v.1.0.2, reinstall System Software in the following order:
1. Install System 7.5.
2. Install software for your DOS Compatibility card. Follow the installation instructions in the DOS Compatibility ReadMe.
3. Install System 7.5 Update 1.0 (Easy Install).
4. Install any other software.
Note: Installing System 7.5 Update 1.0 prior to the installation of your DOS Compatibility software will first install PC Setup v.1.0.2, which may prevent you from proceeding with DOS installation.
Custom Install
Doing a Custom Install of either System 7.5 Update or control panels installs PC Setup v.1.0.2 on your system. This control panel is not compatible with your system. If you need to do a custom install, you must specifically exclude PC Setup v.1.0.2 by expanding the Custom Install menu selections and selecting all control panel items with the exception of PC Setup v.1.0.2. Refer to your User's Guide for instructions on using the Custom Install option.
Easy Install
An Easy Install of System 7.5 Update 1.0 does not install over the more current version of the PC Setup control panel that shipped with your system.