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I am searching on the internet, only driver that I can find is for Windows/MAC. HP's Universal Printer Driver PCL 6 DOES NOT support LaserJet 40 printers, as the driver uses a class number. I need the following driver for my SAP system to print correct. The native PCL6 driver for HP LaserJet 4050 (the one available from Microsoft) works the best but it has a few bugs, notably it doesn't support watermarks (this is the case for both Windows Vista SP2 and Windows 7).
HP LASERJET 4050 DRIVER WINDOWS 7 PCL 6 INSTALL
Remove "HP Support Solutions Framework" through Add/Remove programs on PC.HP Support Solutions Framework - Windows Service, localhost Web server, and Software.This tool will detect HP PCs and HP printers.
The printer supports the PCL5, PCL6 (PCL XL) and PostScript Page Description Languages, but from Windows 10 onwards, a PCL5 variant of the UPD is no longer available. Note: This tool applies to Microsoft Windows PC's only. For the (quite old) Laserjet 4050 printer models, it seems that (on Windows 10 systems) the preferred solution is one of the Universal Printer Drivers.
HP LASERJET 4050 DRIVER WINDOWS 7 PCL 6 UPDATE
Technical data is gathered for the products supported by this tool and is used to identify products, provide relevant solutions and automatically update this tool, to improve our products, solutions, services, and your experience as our customer. This product detection tool installs software on your Microsoft Windows device that allows HP to detect and gather data about your HP and Compaq products to provide quick access to support information and solutions.