If you mean the license key, then try this:
If you have lost your license key, and you do not have shipsim still installed on your pc (old or new), and you did not buy it directly off of the website, then the only thing you can do, is show Vstep some proof of purchase, if you have that. A receipt of some kind, to show that you have a legal copy.
If you can do that, send this, along with the request for a new licensekey and the reason, to info@shipsim.com.
If you do not have any proof of purchase, then I am afraid nothing can be done. You yourself are responsible for your belongings, and the safety/whereabouts of those. Sorry.
Regards,
Fred
^ That became a classic quote.
