What happened to one ui

[SwitchTech]

How to get touchwiz because 

[UNKNOWNUSERNAME]

what exactly are you trying to do?

[Glenntech]

Touchwiz has long gone.
What are you having issues with?

Even if you could find a way of getting Touchwiz, likely most apps won't work properly on it now

[Piper123]

Cross reference this post to another this afternoon about the use not having Knox and not being able to access Samsung OneUI

I suspect the device is rooted?

[SwitchTech]

Nah

[SwitchTech]

It's ok I have smart launcher