During installation of Fix-It v15, the installer may detect the prior version of Fix-It on your system. In order to uninstall the prior version, the program will require the computer to reboot after it is uninstalled. When you reboot, you should see a prompt on your screen to continue the installation. If for some reason you did not see this prompt, you can still finish the v15 installation by clicking on the setup icon found on your Desktop. It should have a name similar to the following:
Setup Fix-It v18.104.22.168
The version number may be slightly different based on if you are installing a newer build of the program.