Font missing from Pages after updating to Catalina

I recently updated my computer to Catalina and have just printed out a very long document in Pages and one of the main fonts I used (Mistral) is apparently not in the new Pages Catalina version. This missing font resulted in the whole 60 page document formatting being completely wrecked. The message indicated Mistral and another font CalisMTBol, were missing and as well listed three other fontss, Brandley Hand, Helvetica and Times New Roman, with no explanation. These three fonts are fine in the Catalina Pages program so I don't know why they listed them with this error message.

I did go back to the Pages program in my old computer and the Mistral font does not appear in their list of fonts, but it is finding it somewhere but I don't know where to look for it!! Is it possibly in some other program and if so, can I just copy it (if I find it!!) into somewhere on the new computer where Pages can find it?

Thank you.

Gayleen