How to Find the Hidden Option
As the previous section explained, we first go to the directory with the extracted installation files. From there, we dip into the "Config" folder. Next, we open the "InstallManager.cfg" file with Notepad or a similar editor. Then we find the "Show Update" row at the bottom of the options list. This is set to "false" by default. We enable this option by setting the value to "true" and then save the file.
When starting the installation program, an additional option now appears in the main selection screen:
If you use the previously hidden "Update" option, a new wizard appears:
Here you can upgrade individual components without the need to uninstall them. As far as we can tell, the Installation option only runs a limited automatic uninstallation or even none at all, whereas Update combines a full uninstallation and installation of the selected components in the same reboot cycle. This saves a complete reboot cycle otherwise required during uninstallation. It's also useful after an uninstallation and reboot, because Windows may automatically replace uninstalled files against your will.