How can I update my Cactus RF60 on Windows 8?

What you need to do is disable the Signed Driver Enforcement (also known as digital signature) on your Windows 8.
  1.     Hold down the Windows key on your keyboard and press the letter C to open the Charm menu, then click the gear icon (Settings).
  2.     Click More PC Settings.
  3.     Click General.
  4.     Under Advanced Startup, click Restart Now. (NOTE: In Windows 8.1, the ‘Restart Now’ button has moved to ‘PC Setting -> Update & Recovery -> Recovery.’)
  5.     After restarting, click Troubleshoot.
  6.     Click Advanced Options.
  7.     Click Windows Startup Settings.
  8.     Click Restart.
  9.     After restarting your computer a second time, choose Disable driver signature enforcement from the list by typing the number 7 on your keyboard. (Your computer will restart automatically.)
  10.     After restarting, you will be able to install the Cactus Firmware Updater normally; however, Windows will display a warning message. When the warning appears, click Install this driver software anyway.
Note: The next time you restart your computer, driver signature enforcement will be in effect again. You will have to repeat this process for updating any new Cactus devices. If you wish to update devices with the same computer, we recommend installing the drivers for each one before you shut down or restart your computer.

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