I've been hearing about this for more than a year now. Some of the users have been telling me that they had received this error before. But I personally never had a problem, until I did search for it and found a lot of users complaining about this. It is a valid font, you install it, no problem, another user with the same OS like Windows 10 tries to install the font and get this error. It never goes away and also doesn't seem to be based on anything. Sometimes it's ttf files, sometimes otf and sometimes totally random.
The tech guys all over the internet finally concluded that it may be related to Windows Firewall! No one knows why and how! But my question is is there any font programmer here that could help me to understand why is this happening and how to fix it? I don't know what should I say to my customers sometimes, they have paid for the fonts. Fonts are working and had been tested, but somehow this happens!