Unable to use Scrivener

My computer crashed and I am now unable to use Scrivener. It tells me that my username/serial is invalid, however, I have my purchase receipt. Do I have to upgrade to a new version? This is not fair and I would like to continue to use version 2. It worked fine for me.

Please send an email to our support address. Include a copy of your receipt so that we can look you up in our records.