Hi
Dr. Byte has some advice here:
https://www.zen-cart.com/showthread....l+server+error
He also gives a link to follow but I didn't have time to do that. But getting that error file would be my next step.
I'm new but when I upgraded a month ago, I installed a new 1.5.4 into a temp directory and made a copy of my working database and brought that in. But I don't see why your way wouldn't work also (starting with a copy of 1.3.8 and then upgrading that to 1.5.4). I did get help with my database though and there are a lot of good people on here who have good rates should the need arise.
If you aren't sure of what additions you might have made on the original you can do two things (that I can think of). First, once you get the copy working, you can look at your admin menu and compare the two (current and copy). That should give you some information. You can also use a directory/file compare program to see the differences in the two. I like BeyondCompare3.
Good luck on the first part. And don't stress.
Oh, and there is a great tutorial on installing:
https://www.zen-cart.com/content.php...pgrade-my-site
Lin


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