You may need to delete Google Web Designer from your computer in order to install a fresh copy. For instructions on how to uninstall Web Designer, select your operating system:
Mac
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Drag the Google Web Designer app icon from the Applications folder to the trash.
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Open Terminal and run the following command in a single line:
rm -rf ~/Library/Application\ Support/Google/Web\ Designer ~/Library/Preferences/com.google.WebDesigner*.plist -
Reboot your computer.
Windows 7
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Open the Control Panel.
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Under Programs, select Uninstall a program.
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Select Google Web Designer from the list of programs, then click Uninstall.
Windows 10
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On the Start menu, select Settings > Apps.
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Select Google Web Designer from the list of programs, then click Uninstall.