After installation ends just close 3uTools and tap I have finished the installation in iKey application window.After 3uTools starts, tap the install drivers button to install everything that is necessary for the procedure.Necessary is just tapping in a new window the install button and after lunch button in 3uTools software.Software after start detects that you got all necessary tools and drivers installed to can bypass iCloud and if not will download and start the installer for the user.
If you plan to restore firmware or update it always remember to check if the new iOS version support jailbreak because without this you end up with the original iCloud account and locked iPhone 7 Plus!
Bypass iCloud activation lock is temporary(!) mean work until you Hard Reset APPLE iPhone 7 Plus or update iOS by cable(by WiFi is disabled).