I have the same problem and mine was working just fine, but then it crashed once and it gave me this message. I fixed it but then just clicked the quit button and tried running it again. It worked fine, but today it happened again and this time it wont run when I click the cancel button. I dont know if I have to do anything different from you guys since you are trying to download it.
@Torezu:
You mentioned somthing about it can say this when trying to run it too? Please tell me what the other half of that post was.