HP does not list a model named "A799" in its consumer or commercial printer lineups. Assuming you mean one of the following, please pick the closest match:
: Connect the USB cable when prompted. In the port selection menu, choose a USB virtual printer port (e.g., USB001). If multiple are listed, it is recommended to start with the highest number. Test Print hp a799 thermal printer driver download link
This version is compatible with Windows 7, 8, 10, and 11. 64-bit Driver v3.1.01 (via CognitiveTPG). 32-bit Driver v3.1.01 (via CognitiveTPG). HP does not list a model named "A799"
https://support.hp.com/us-en/drivers/hp-photosmart-a630-printer-series If multiple are listed, it is recommended to
: During setup, if you are using the HP-specific driver, you may need to select "HP A799 Partial" from the dropdown menu for optimal compatibility. Port Configuration
If your printer isn't responding after the driver installation, try these quick fixes: