Preview chooser not working?

For some reason, I cannot actually choose an image in the image chooser (which, btw, I could not find by search in custom nodes manager but had to go download manually).

What could be wrong?

As you can see, the node is there in there workflow but when I click on Custom Nodes In Workflow, it’s not there.

Also, I notie that the manager seems to look different for others. They either have a menu to the right, or more stuff in the top right corner. Also, there’s a red line in the top left of my screen.

Are these sign of there being something wrong?