I have the same Problem here in Germany.
TL-SG108E connected to IP-Network which I have changed to suit the TP-Link Network.

Router 192.168.0.80
Switch 192.168.0.1
PC 192.168.0.8

Ping wird ausgeführt für 192.168.0.1 mit 32 Bytes Daten:
Antwort von 192.168.0.1: Bytes=32 Zeit=10ms TTL=64
Antwort von 192.168.0.1: Bytes=32 Zeit=7ms TTL=64

Started the configuration Utility:
what ever I select I get the error "Timeout, no Response from Agent"

Switch bought via Amazon.de

cheers
Jens

Hi Jens, internet connection works OK by the switch?
What's the operating system of the PC? Tried it on a differnet PC?

I'll start my posts with this.
this is in no way professional advice, I'm struggling to setup my network myself, and can't find much help myself.
So I'm trying to fiddling with the settings and I'll try to interpret what happens from that as best as possible.
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I also had it happen at moments.
Did you set the switch IP to be given out by the DHCP? or manual?

! (What I think happened here)! Is that the switch somehow links to the modem (ISP) so then it is in the IP range & subnet of the modem.
and the tp-link utility does not recognizer the switch, or regognizes it, but can't access it because it is in a different range.

I reset the switch, linked it directly to a laptop, setup a manual IP, in range and subnet of my home network.

Hope it helps in any way.... if not , just disregard my nonsense.