+x Stacy (Staff) - 3/6/2018 9:35:44 AMHello,The oven programming lead uses an FTDI USB to RS485 converter chip, this is the part that requires the driver. Please find below a link to the driver download directly from their website. Please ensure you select the correct operating system version and also the 32 or 64 bit version as required. Driver DownloadHere is a link to their installation instructions which include a more detailed troubleshooting section.Installation InstructionsIf you have any more questions, please ask.Stacy