I uninstalled the utility and then downloaded and installed the version dated 2020-11-27.

I had to select refresh as it said no devices attached and then it found them.

Only thing is I had named them all so I knew which room each was in but it has renamed them to device-XXXX so guess I will have to work out which is which and rename them again.

But the utility is now working again.

Bill

@BillyMac Aha, yes, I didn't spot the newer version as it had Mac and Linux in the list of operating systems. Now done, and yes, it works again.

BUT...

Defender Antivirus doesn't like it at all.

Do I either have to be naughty and install it on my work laptop, but have the ability to manage the extenders again, or I have to forego the managing of the extenders to keep my laptop 'clean'.

@JabeSmith 

When I installed it, a pop up appeared warning me about installing it but I just ignored it.

I think it was a warning from windows but cannot remember.

@BillyMac 

This is exactly what I did with the 2020-11-27 version and it still wont find my devices. I might remove and install again and see what happens.

@sfarkas 

I had to hit refresh and it found them but it is not the quickest at finding them.

@BillyMac 

So I managed to get the latest version of the app to find my devices, BUT only if I connect via ethernet. If I connect to one of the devices wifi signal, I have internet but the app then refuses to find the devices. As the laptop I use isn't usually near one of the ethernet devices, this is still an issue for me.

@TP-Link 
 

This updated software version solved my issues. Thanks a lot!
 

However... I only managed to find this thread, and by consequence the newest version, through the help of the community (for which I am very thankful!)
I think every customer would be very happy if one were to update all links for the tpPLC utility on each driver download page? Im saying this because most of those links still refer to the Flash based version.  

@JabeSmith I have exact the same problem! What can I do?