PHP Code:
    use Zencart\FileSystem\FileSystem;

    
$test FileSystem::getInstance()->getPluginAbsoluteDirectory('EZ-Feeds');
    echo 
"-------->" $test "<---------<br>";
    
    
$path_info dirname(__DIR__3);

    echo 
"-------->" $path_info "<---------<br>";

    die(
'<br>' __FILE__ ':' __LINE__); 
i would explore the dirname (as well as pathinfo) functions in php. much more reliable. you might need to append a trailing slash.

i would advise you to use your own version number for your plugin; ie 1.0.0 and update as necessary. 1.5.7c is the zen-cart version, not your plugin version.