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If you experience "communication errors" during setup, try these manual fixes: Run as Administrator : Right-click your installer and select "Run as administrator" to bypass modern security blocks. Disable Bidirectional Support Printers & Scanners in Windows Settings. Select your SCX-4521F > Printer Properties "Enable bidirectional support" and click Apply. Virtual USB Port : Ensure the printer is assigned to a (Virtual printer port) rather than a WSD port. HP Support Community 4. Hardware Maintenance For the best results when generating documents: Clean the Scanner Glass

Do not look for "SmarThru 4" specifically as a standalone modern download. Instead, you need the legacy and the Samsung Easy Document Creator , which replaced SmarThru. smarthru 4 samsung scx4521f software download fix top