Here is the file structure of an empty runtime. The Folder Name can be changed to anything but Poser has to be pointed to wherever you install this external runtime. I went ahead and posted this for you and any other people new to poser who might have the same question. Hope this helps you and them :)

Edited to correct a typo on wherever. I mean the word wherever :)

The dust settled, thinking "what a fine home, at least for now" not realizing that doom would soon be coming in the form of a vacuum cleaner.