Yes Max it’s a TP-Link TD8840T wired modem/router. I hadn’t used it for a while as it’s 10/100 and I use 1000 on the LAN, but I had to return the main router so I reverted to it.

The DNS is obtained automatically from my ISP so I’m not sure how that would get changed, but I have to admit that networking isn’t anywhere close to my strong suit!

I haven’t got round to switching back to that router to test it. I’ll check the DNS if I get the problem again when I do.

(I have found two friends with different ISPs both using wireless modems (so not that model) who have told me they’ve got the same problem but as I haven’t seen their devices I have no idea whether they really are or whether they are just confused by Adobe genuinely telling them they need to update.)