Knowing that this is Wise Installer file, installing it is rather easy by following these steps and knowing command line switches of these installers: Installing a malicious one would be catastrophic failure. I wouldn't download drivers from any third party websites as drivers have highest accessibility rights on a machine. I personally trust only OEM downloadable drivers so this one is directly from Sony. The good thing is that this is just a Texas Instruments PCIxx12 FlashCard driver and can be installed on any machine from any manufacturer that has this device built in. I successfully installed this driver on an HP running Windows 8.1 圆4.

The only problem is that it uses a Wise self executing compressed installer which also checks machine compatibility. Latest driver (version 2.0.0.20) for this device that I've found is from Sony.