Shutdown SmartSDR and the FLEX-6000.
In the Windows Control panel, go to "Programs and Features" or from Windows Search, enter "Add and Remove Programs" window and look for the "FlexRadio Systems FlexVSP" driver, and uninstall it.
Then restart the computer.
For 64-bit operating systems:
After the computer has completely rebooted, open the Windows File Explorer, go to C:\Program Files\FlexRadio Systems\FlexVSP
Double click "FlexVSPInstaller_64.msi" file. Follow the defaults and agree to all the questions.
For 32-bit operating systems:
After the computer has completely rebooted, open the Windows File Explorer, go to C:\Program Files\FlexRadio Systems\FlexVSP
Double click "FlexVSPInstaller_32.msi" file. Follow the defaults and agree to all the questions.
After the installer has completed, Restart the computer again.