Same thing happened to me today while installing WxLink on my new Mac. Jerry @ Davis just told me what I did. After ensuring 32 bit operation and determining that the correct driver came with the CD for my OS, Jerry figured out I probably dragged the app from my folder (in Finder) to the desk top to create an icon. On a Mac, this drags the app OUT OF THE FOLDER. WxLink needs all four files in it. If you did this, merely drag the icon back to the folder in Finder. I'm a PC guy using WxLink for years - just now learning Mac. BTW, between my questions on the Vantage Pro years ago and my new Vantage Vue, customer service has been superb!