If the old version of Cacoo Ninja is already installed, you will be unable to install the new version immediately.
Please uninstall the old version, restart your computer, and then install the new one.
Uninstalling Cacoo Ninja from Windows 10:
Click on the Start Menu > Settings > System > Apps & features. After this step, there will be an installed applications list on the right-hand side. Please select Cacoo Ninja and click 'Uninstall.'
Uninstalling Cacoo Ninja from Mac:
Finder > Drag Cacoo Ninja to the Trash from the 'Applications' tab
After restarting the OS, please install the latest version of Cacoo Ninja from the Cacoo Ninja page.