CS-Cart release the updates over the period of a week so as not to update everyone at once, thereby spreading the load on their servers and their capacity to handle any problems that may result. You cannot control who gets the updates first but you can install a fresh 3.0.2. I believe the reason is that if you have any problems with a fresh install you would not require the urgent assistance that someone with a live store would require if the upgrade failed (and if there was a major problem they could limit the consequences).
Also in settings -> general there is the option "check for updates automatically".
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