This section is provided for convenience. It is recommended that you check the official Tripplite page for the Keyspan drivers, here.NOTE: AVL recommends the Keyspan USA-19HS for the Compu-Dobby I, II, III, III+ and IV 9 or 25 pin serial to USB conversions. The Keyspan USA-19HS uses the TI USB chipset, which with its drivers has proven to work reliably. We DO NOT recommend using any USB-serial adapter with the Prolific USB chipset, as they are notoriously unreliable.Download the Keyspan USA-19HS driver corresponding to your operating system below:Windows Drivers:Driver for Windows 10 Home and Windows 11 ProDriver for Windows 7, 8, and Windows 2008 Server R2Driver for Windows 2000, XP, 2003 Server & VistaDriver for Windows Server 2012Mac Drivers:Driver for Mac OS Big Sur and Monterey (Please see the instructions included in the zip file of the download prior to installing this driver)Driver for Mac OS X 10.12 to 10.15.xDriver for Mac OS X 10.9 to 10.11Driver for Mac OS X 10.7 to 10.8.xDriver for Mac OS X 10.6