1.If you are not using status monitor applications, then you can upgrade to UPD 126.96.36.199. If you are using status monitor applications, then use only UPD 188.8.131.52. 2.This version of the driver contains only bug fixes. If you are using a private print driver, then check the updates before installing this version to avoid losing specific fixes for your private print driver. For detailed information, please refer to Technical White Paper under Universal Print Driver page. Microsoft Certified Windows Server 2003, Vista, Server 2008, Windows 7, Windows 8 and Windows 8.1 32 bit PCL XL Emulation Universal system driver. Microsoft Certified Windows Server 2003, Vista, Server 2008, Windows 7, Server 2008 R2, Windows 8, Server 2012, Windows 8.1, and Windows Server 2012 R2 64-bit PCL XL Universal system driver.