Ensure your external dock is powered on. Try a different USB port, preferably one on the back of the motherboard if you are using a desktop.
Setting up PC Clone EX is straightforward: install the EXE, plug in your drives, and select the clone function. However, the setup process often feels clunky. The "setup 201 31" iterations found on third-party download sites are often riddled with adware or "bundler" installers. pc clone ex setup 201 31 free