Carl wrote These setup methods provide the option to customize the extender’s SSID, allowing you to designate a specific, separate name for the extender so you can tell which Wi-Fi signal you’re...

I found it on TP-Link's website finally after search See this <https://static.tp-link.com/tpPLC_Utility_Mac.zip>

Sometimes you can't rightcopy some words from the website, this often be a broswer's limiation or site protection. Anyway, the Ctrl+C and Ctrl+V useful sounds a good news