I don't want to muddy the waters but, I believe this may be part of the problem.
The distro from github contains a folder called 1_5_7.
The first file is an exact match for the current 1.5.7c
The second file has portions that have been updated by DrByte SINCE the release date of the file. So if you blindly overrite that file, you will lose the changes in line 184 of the current 1.5.7c file.
The third file is the same situation as the second BUT the more recent changes on lines 15/16, 157, 162, 200, 424, 450, 1120-1122, 1252-1254, 1265-1268, 1277, and 1288 will be missed because the github version is dated
Code:
* @version $Id: DrByte 2020 Jun 08 Modified in v1.5.7 $
while the 1.5.7c version is dated
Code:
* @version $Id: mc12345678 2021 Feb 22 Modified in v1.5.7c $
The fourth file is basically the same situation as the third except the update this time was done by DrByte. The shipped file is dated
Code:
* @version $Id: DrByte 2020 Oct 05 Modified in v1.5.7 $
While the current 1.5.7c version is dated
Code:
* @version $Id: DrByte 2020 Oct 28 Modified in v1.5.7a $
You also need to carefully merge the admin/orders.php file if you have any mod installed that used that file.
Hopefully, that knowledge will help in the process.
I have not yet fully tested my installation (empty database) but, I will be testing it this week and will report back what I find.
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