The should be no need to install drivers for the Corechip SR9800 it should pug into Windows 7 onward and work straight away. If you do need to install the driver manually you can they are below. These adapters are cheap sometime $2 shipped from CN, so expect what you pay for, these are prone to failures.
Supereal SR9800 USB2.0 to Fast Ethernet Adapter Driver (setup package)
File: SR9800-Windows-Driver-Setup.zip
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Supereal SR9800 USB2.0 to Fast Ethernet Adapter Driver (manual install)
File: sr9800-drivers.zip
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