Ok so after I got the new downloader done, I thought what the hell, I'm just going to hit the install button and see what's what, I then get that message what I have written in the title but behind this small error screen is the downloader, anyone else getting this or if not just go hit the install after yesterdays new downloader and see what you get, I don't know if i'm ready to go or if I have indeed got an error and need to re-download again..
It's weird because even after I press the install button it takes me to the agreement stage of the install, I then scroll down so the "Agree" icon lights up, then after hitting that, that's when the message comes up.
So I'm wondering if this is just Blizz putting this in there like a file just to make it so I can't download until its launched.
To be safe, I'd re-download again after deleting that file. If you try to run it, it should say what the posters above mentioned. Anything else, and its likely you got corrupted somehow along the way. Make sure you are using the newest downloader they said to run.