I believe the problem I experienced is that none of TP-Link's tools work if the app is given a more informative name. For example, today I downloaded the newest "tpPLC.app" and it worked quite...

Unfortunately, under 10.11 (at least) this package presents a flash screen saying "confidential, only for test" and then immediately aborts. The failure I reported above was under 10.11.

Today a customer of mine complained about poor internet performance. His TP-LINK PLC has been operating on channel 11 for most of a year, and he had recently installed one of those damnable HP...