exploded view

For some reason, I am unable to make an exploded view, as the option is completely greyed out. Here is a picture of the assembly if that helps at all. (Don't think about my mate usage too much lol)

Hi. Is it possible to make the exploded view as a configuration, that I can open in a tree and choose whether I want to see my assembly or the exploded view of it? 

It is possible in an assembly explode view to reused a subassembly explode view

I note the explode app seems to be gone from the app store? Did it break and was removed or is something weird with the app store?