In case you’re updating an existing KNIME installation where the jBrowserDriver has been installed, you need to uninstall jBrowserDriver before, else wise you’ll see a “Cannot complete the install because of a conflicting dependency”.
For that, go to About KNIME → Installation Details → Installed Software and there uninstall “Selenium Nodes for KNIME: jBrowserDriver” by selecting the entry and clicking “Uninstall…”
Afterwards, please run the update again.