Add the following lines to your web.config

<system.webServer>
 <staticContent>
   <remove fileExtension=".woff"/>
   <mimeMap fileExtension=".woff" mimeType="application/x-font-woff" />
 </staticContent>
</system.webServer>

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You have to add these lines because by default Apache is not configured with .woff.

Hope this will help.

Thanks.

@esmi Will speak to the theme developer for sure.