Drag the icon into the Applications folder alias. Do not run it directly from the DMG.
If you must run version 16 on a newer Mac, your best bet is to use a Virtual Machine (like Parallels or VMware) running an older, supported macOS. 🌟 Why People Still Look for Version 16 Filemaker Pro 16 Download Mac
If you purchased FileMaker 16 directly from Claris, locate your original confirmation email. It contains a unique link to your ESD page , where the installer and license key remain accessible for existing owners. Drag the icon into the Applications folder alias