Installing the HP a799

Run all Windows Updates
Plug in both the power and USB cables
Download the 'HP Windows Receipt Printer Driver.zip' file attached to this article
Right click the downloaded .zip file and extract all contents
Run the setup file
When prompted, click the correct processor type (32-bit or 64-bit) and click the HP A799
On the first dropdown, select HP A799 Partial (should be the last option on the list)
For the port, you’ll need to select a USB port. This is where it gets tricky. If there is more than one USB port, you may need to try each one until you find the one that works. I recommend starting with the highest number first and working your way down, as the higher numbers have been plugged into the computer more recently.
Once you’ve selected a port, install and attempt to print a test page.
If the test page fails, retry steps 5 and 6 until you find the right USB port.
Follow the steps in our Help Center article to add your logo

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