License validity

Hi I bought the s2member single Single-Site License in 2013 and was not able to use it. I am now trying to install and use s2member but the website is saying that I do not have an account nor is the email or user name valid. I checked it against the initial email too.

Where/how can I get it activated so I can use it?

Your best bet is to use the link for Sales questions here: https://s2member.com/support/.