hi, all,<BR> Sorry for send a mistake message to you. When I downloaded Ipopt_2005Oct18.tgz from <A href="http://www.coin-or.org/Tarballs/">http://www.coin-or.org/Tarballs/</A> , I clicked it and save it as usual. But the file name is set as 'Ipopt_2005Oct18.<STRONG>gz</STRONG>' by default. I tried several times and got the wrong file at last. In fact, we should rename it as 'Ipopt_2005Oct18.<EM><STRONG>tgz</STRONG></EM>' and save it to the given location and it works well. I didn't find it until today. Sorry for sending the last message. And if you meet with the same question please try this way!<BR> <BR><BR> Good luck<BR> W. Zhang
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