I have the same problem. It would be nice if Adobe would address it.
I have this problem too. I went on to Adobe chat, and they refused to tell me what to do about the vendor ID. They told me to go to the Adobe help site, but I see no reference to this problem. I just want to download some library books to my ereader. The person on chat basically said that, since ADE is free, there is no chat support available. What a crock.
Don't you think it's about time somebody responded to this kind of problem?
The whole ADE business is a f'ng disgrace, with every roadblock known to man being thrown up when you try to "authorize" a computer. I've just tried to change a computer's authorization to be associated with an Adobe ID, and all I get is the message "You can only authorize this computer with an Adobe ID that hasn't been previously used to authorize any other computer or mobile devices. Please try again."
Of course if you are dumb enough to try again, you get the same result, over and over.
A computer died, I replaced it, now I'm getting this crap and wasting hours of my time.
As I said, a f***ing disgrace.