If Printix Client has issues adding a print queue on a Windows computer, it may be that a firewall has prevented the download of the print driver from the Printix driver store (https://drivers.printix.net/). The print driver is downloaded as ZIP file into the folder: C:\Windows\Temp\Printix-drivercache
RESOLUTION: Set up your firewall to not have any size restrictions on the ZIP files it can download from https://drivers.printix.net/ and/or set it up to not scan files downloaded from the Printix driver store.
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