We rely on the standard set of fonts that are installed on all Macs by Apple. If you're getting that error, make sure you have the "Arial" font installed - if not, you'll need to replace it for Hero Lab to work.
AFAIK there's no way for one font to "replace" another - to get this error, the original font must have been removed. Did you maybe run a third-party font manager application that removed it?
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