@Kevin_Z and @Solla-topee My Mac is now at version 10.15.6 and the "beta" Mac version of tpPLC is still not able to perform a firmware update on my TL-PA9020P(US) Ver. 4.0 kit. As a workaround,...

@Solla-topee Thank you for your reply. The two devices for which I am trying to update the firmware are both Model TL-PA9020P(US) hardware version 4.0. They are currently functioning on my home...

@Solla-topee Thank you for the reply. I uninstalled my existing version of tpPLC and installed it afresh using the link you posted. With the newly installed tpPLC app on my macOS 10.15.5, I observe...

@Kevin_Z I am running macOS 10.15.5 and have the downloaded (beta?) tpPLC version V1.2.3596.1 -- it has a watermark "Confidential Only For Test" and provides some diagnostic information. It, however,...

@Solla-topee Unfortunately, that does not help. I installed from the link you sent, but when I run the application, the window disappears immediately on my macOS 10.15.5 computer. I note that the...

@Solla-topee Unfortunately, the version this gets me to is only applicable to MacOS 10.7 - 10.12. I am running MacOS 10.15.5