I'm in the process of updating from 1.3.9 to 1.5.4. It seems the process involves getting it all correct in a test directory and then updating the live site. The issue is that the live site accumulates orders as your are getting the test site up and running, otherwise one could just switch to the new test site with no worries.
Is there a script out there that can copy any new orders in the live site to the test site? If so, one would only need to put the live site in maintenance, run the script and then make the test site the live site.
With this approach, if something went horribly wrong, you still have the original site you could quickly switch back to.
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