edit the LibraryPrefs.xml in your C:/Users/(usernamehere)/AppData/Roaming/Poser Pro/11 remove the purchases bit and save the file. Then set it to its attributes to read only. As long as it is set to read only, it won't be added.

Of course if you want to add another runtime to your library later, you'll have to remove the read only attribute, but then poser will add the purchases bit back to it again.

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Consider me insane if you wish, but is your reality any better?