Have you downloaded the additional content available (there is a link on the page from which you download poser 11.2) In there their is a file zzlegacy poserfigures zip. I've just downloaded this and tried out Miki4. It does look for a fill base.obj, and then seems to keep searching for a file ball.obj. However Miki4 seemed to load ok if I just clicked on the ok each time a warning came up. So perhaps you could try downloading and installing that file (again if you have already done it)

However, I already had Miki4 in my runtime, so although I put content of the zz… zip file into a new runtime and set my search to none, it still might have found the files I already had.

So if you still have a problem best to contact customer support.