Run the original installer as Administrator . Right-click the setup file and select "Run as Administrator."
Do not just delete the folder. Go to Control Panel > Programs and Features . Find Mastercam X5 and uninstall it. mastercam x5 error .exe not valid
This error is a show-stopper. You click the icon, expecting the familiar splash screen, but instead, you are met with a cryptic system warning. Run the original installer as Administrator