Lightroom 13.1 and NLP 2.4.2. Can’t activate NLP. Nothing happens.
Welcome to the forum @leif.lundholm
I’ve come across a situation in which I had to enter the activation code several times before it was accepted. I recommend you try this, restart Lightroom and check if things have worked out.
If they haven’t, search the forum for posts about similar issues. Others have had this and if I remember correctly, a few procedures were proposed, also by @nate himself.