Upgrading existing Projects using the Zebra Label Printer driver Projects that use the old version of the driver (Zebra Label Printer StreamServe 3.x), cannot be automatically upgraded to use the new driver. If possible, you should consider replacing the old driver with the new Zebra Label Printer driver, which has improved functionality and is easier to use, especially when working with barcodes and graphics. However, if required, you can continue to use the Zebra Label Printer driver for StreamServe 3.x in StreamServe 4.x.