I have a user who has Windows 7 and we have an enterprise license but it keeps giving us Invalid Serial Number. Our purchaser verified that Adobe said its a good license. Why do we keep getting Invalid Serial number during installation?

Not sure why Adobe would orovide anything to the user, I'd expect they would provide things to the enterprise coordinator Who delivers to the user. Maybe the user contacted Adobe for help and they assumed this was a retail user. Please download from your enterprise portal and deliver.

That still leaves many possibilities. Did you download it as a trial, the continuous retail product, the classic retail product, or through your enterprise portal? Only the last will work.

How exactly did you get the install media/download?