File Hashes
If you have downloaded When Then from an alternate source, you can verify it against the following hashes to ensure that it hasn't been modified in any way. An application such as QuickiHash can be used to perform the verification.

    Product   When Then
    Filesize   272,362 bytes
    MD5 Hash   E7A1974D50A9B64D8523F40D3CB6332E
    CRC Hash   167E9F16