Zen Cart 1.5.7
PHP 7.4.12
Ceon URI Mapping 5.1.0

I had a number of warnings logged from this module.

The first is in includes/classes/class.Transliteration.php
The warnings are like, and spread across multiple locations within the file.
Code:
PHP Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/xxxx/public_html/includes/classes/class.Transliteration.php on line 118.
The fix is to replace the { } with [ ]

For example, line 118 was
Code:
if ($str{0} < "\x80") {
and should be changed to
Code:
if ($str[0] < "\x80") {
This needs doing on the following line numbers: 118, 135, 143, 167, 169 (twice), 171, 172 (twice), 174, 175 (three times), 177, 178 (twice), 179 (twice).