Permissions are all OK (just checked).<BR><BR>I've been checking other setup.exe files in my archives. None of them work, at least none of them that are InstallShield setup programs.<BR><BR>The ...

Learn how to download and install the Windows 11 23H2 update on your device with this step-by-step guide.

After launching setup.exe or the Media Creation tool, you'll have the choice to upgrade now or to create an installation ISO/USB drive – you want to Upgrade this PC now.

Just install 7zip. Then open a Windows explorer window, right-click on the .exe and select open archive from the 7zip context menu.