Slui.exe doesn't display menu to change product key.  

You may have dependencies that are corrupt.. run a diagnostic report to check for tampered files

See Activation troubleshooting - Windows 10 Forums

Berton said:

Just a note, I tried slui.exe on my production machine with Version 1703 Build 15063.540 and it worked but had to be careful to close/cancel a blue panel that appeared over the panel desired.

Version 1703 Build 15063.540 here and slui runs just fine for me. It opens Settings > Update & security > Activation and then opens the "Enter a product key" panel that you would get if you clicked "Chang product key" on that page. Nothing happens unless you enter a key in that box and click next. Even then, it has to be a valid key. And even then, you have to click one more yes before it does anything. You'd have to work at it to un activate your system.

Did you try what Superfly posted? "slui.exe 4" does nothing when I run it from an admin command prompt? Nothing I can see on screen anyway.

Yes slui.exe 3 does the same thing as running just slui.exe.

I don't actually have a problem per say? I can just go to Settings > Update & security > Activation > Change product key and change my product key the normal way. I do it fairly often actually. I switch from Pro to Education or Enterprise that way without reinstalling. What is the Settings menu slui.exe 4 is supposed to take you too?

streetwolf said:

I ran the advanced Diagnostic test and it came back clean. It ran in about a second so I don't think it is testing much. Just looks like it deals with product keys and such.
If you get slui 4 to run then it will probably get my slui/slui 3 to run. Let me know if you fix your problem and how you did it.

ADT uses MS built-in diagnostics to test activation... if by 'clean' you mean no tampered items (and no event log errors) then there are non-activation files that are corrupted... running sfc may help to test integrity of those.

BTW: Slui.exe uses multiple switches (including error code checking)