Database Update

[manythanks]

I am upgrading from 1.3.9 to 1.5.3 and the test site is almost done so i will be going live in a few days.

I started on this two months ago and obviously made a copy of the database and ran the db update that happens at the beginning of the zencart install.

In the meantime, the 1.3.9 existing/live database has been taking new orders and getting new customers. What is the best way to get those new orders into what will be the live database that doesn't have the last two month's data but is updated for 1.5.3?

Is there a way to just update the 1.3.9 database without running an install, too?

I apologize if i posted to the wrong spot. I cannot find this in the install topics/discussions.