before running the new installers to avoid driver conflicts. Connect via USB
| Component | Source | |-----------|--------| | Full SmartThru 4 + Driver package | HP Support → Samsung SCX-4521F → Driver → “Samsung Universal Print Driver” + “SmartThru 4” (separate) | | Direct legacy link (if still active) | ftp.hp.com (rare) – safer: use HP’s official support site | smarthru 4 samsung scx4521f software download fix top
and searching for the "Easy Document Creator" under the software section. Use Windows Compatibility Mode: If you have an old installer for SmarThru 4 Right-click the setup file and select Properties Compatibility before running the new installers to avoid driver conflicts