if it weren't for Istel and Novski I would have never been able to program my LPC1769 on my Mac. Unfortunately, I didn't realize that I had to "activate" the LPCxpresso application before it would work with its free version. To activate it, you go to the "help" menu of LPCxpresso and select "Product Activation/Create Serial Number and Activate". That will give you a window with a long, long serial number that you shouldn't even try to write down because the are Os, 0s, Is, and 1s in it. Very confusing. I found the only way to get the serial number and activation code was to check the boxes to "Copy Serial Number to Clipboard" and "Open External Browser". When you do that, it transfers the serial number and states that it will send you an e-mail with the Activation Code. I waited for a long time to get the e-mail which never came. It turns out that the Activation Code is returned immediately just below the line in the external browser where the serial number was automatically entered. Then you can copy and paste that Activation Code into LPCxpresso Help menu "Enter Activation Code". From there things went smoothly :-)