Follow the FDM installation guide to enable the browser extension for Chrome, Edge, or Firefox.
If you are working with database files often labeled as .phd (sometimes mistaken for PHDM), follow these steps: Download PHDM zip
These are proprietary files from Corel Paradox , often bundled with WordPerfect Office. Follow the FDM installation guide to enable the
PHD File Extension: What Is It & How To Open It? - Solvusoft Download PHDM zip
If you are simply looking for a "Download Manager" to handle a large ZIP archive safely: