We can't tell you anything about unauthorized resellers or unauthorized downloads.
There are a handful of authorized download sellers, they are all names you would recognize like Amazon, Staples, and so on. Many more stores are authorized resellers of the CD version. If you bought a download from an unauthorized reseller, we can't help you verify it. At best, it is pirated, and you are cheating turbotax out of the profits they need to pay the programmers who actually make the program. At worst, you get a corrupted program, or nothing, or your credit card info gets stolen.
