Cant Access Already bought Game

I bought big pharma when it was in alpha or beta and so it wasn’t available on steam. I have since got a new computer so I went to re download it but cant find out how to reinstall it on my new computer. If i could get help on this or if this has happened before please reply and give me ether a way to re download or a url to a previously resolved same/similar post as mine .Thank you for your time.

Hi, if you email cliff At positech dot co dot uk, with the email address you used when you bought the game, we can re-send you a link to your copy.