How can I download fulltext via endnote x2 from ACS?

I have got a problem: I could download fulltext from ACS just after I fixed the soft named ENX2Inst and EN1201Patch. But some days latter I cannot download fulltexts via endnote x2 from ACS any more, though I can down them via web.Can you help me for it?

I am looking forward to your reply.