The .fzip file is a Foxit add-on package format. It can only be recognized by Foxit applications. We could not double click to open the .fzip file directly, but we could install the .fzip file from within Foxit program.
To install
Open Foxit PhantomPDF for Business or Standard, navigate to Help menu, click on Install Updates, choose the .fzip file and click on Install to install it.