Few days ago, I got a problem with the 6.20 version of C51 keil Software, like you can see on http://www.keil.com/forum/msgpage.asp?MsgID=3260 . Keil support found what's append and send me a mail with a new version of OH51 (v 2.6) that correct the error due to the long NAME statement that I am using. And, thanks Andrew to help me to find my problem.
But Jon, that didn't answer Jon's (!) problem, which he has aired before in this forum: It's difficult to find out what the latest release is. Oh. That's simple. Go to http://www.keil.com/update If you have heard about a release and it's not listed there, it's not an official release. Jon