When running an installation with standard settings, the installation process hangs when copying the .msi to the desktop. This also created a +3GB temp file on the desktop. Installation has to be aborted.
1. When running the install, choose the 'Extract installer only (.MSI File)' option instead of the default setting, and run the install directly from the newly extracted .msi file.
2. Uninstall previous versions of Toad, reboot PC and run the main install executable again.