I am trying to install the ExtLib in Designer, but no matter what I do I get the error "No Acceptable Features Found". I have deleted and reinstalled the download several times, but nothing seems to work. I have searched my hard drive for any hidden installations, yielding nothing. In Application Management, there is nothing listed under the extension plugins. What am I missing? I have Designer Revision 20110916.0921 (Release 8.5.3) .