My friend is having trouble installing Ardour on his Windows computer. It gives an error message as shown in the picture
That looks like Ardour crashed in the past
The solution is to reboot, and then re-install.
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Usually the font is unregistered when Ardour is closed. - However when Ardour crashes or is force-quit, the custom font will remain registered until you reboot the system. Until then the font-file cannot be removed or replaced.