I have this issue sometimes. With the scanner's power cord unplugged, hold down the power button on the scanner. Now plug the power cord back in. Wait until the power button LED turns blue. Continue holding down the power button for 5 more seconds. Now release the power button. Your scanner error of "scanner not found" should be disappeared.
I bought this scanner on Amazon back in 2013, when I had Windows 8. This scanner then has worked fine with Windows 10.