Convert ffil to ttf

An FFIL file is a suitcase. This can be either a Type 1 PostScript screen font suitcase which cannot be converted. Or it can be an old legacy OS 9 style suitcase, which has TrueType outline fonts within.

Regardless of that slightly finer point, there are lots of free font converters online. You just upload the font you want converted via the site's interface, and it provides a link to download the converted font type. Here's just a few:

https://www.fontconverter.io/en

https://www.fontconverter.org

https://convertio.co/font-converter/

http://www.freefontconverter.com

What Apple device are you using and what operating system version is it running? That may help other answer.

Thanks. I'll ask the mods to move you to the Catalina forums. This section is for asking how to use the forum software and does not get as many views as the OS forums.