The Samsung Smarthru 4 is the legacy software suite designed for the Samsung SCX-4521F multifunction printer, managing scanning, image editing, and OCR tasks. As Samsung's printer division was acquired by HP, all official software and "fixes" for this device are now hosted through HP Support. Software Download & Modern "Fixes"

This guide provides the top fixes and the correct download source for the SmartThru 4 software.

Do not buy "driver fix" software. The official HP/Samsung drivers are free. Follow this guide, and your SCX-4521F will scan like new again.

  1. Enable .NET Framework 3.5 (includes 2.0 and 3.0):