Siemens SL2-141 User Manual page 22

ADSL Router User Manual
Or if you do not have a disc, but have the driver files on your PC, you can follow the steps below:
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Press I don't have the disc. Show me other options.
Select Browse my computer for driver software (advanced).
Press Browse to set the path for the driver file, and then press Next.
Wait while the system installing the driver.