Add support for non-standard Theme Directories

Currently the theme directory path is hardcoded as substr($_SERVER['SCRIPT_FILENAME'],0,-19).'wp-content/themes on line 41 of main.php this should be updated for non-standard WordPress content directories.

One solution is to replace
$root = substr($_SERVER['SCRIPT_FILENAME'],0,-19).'wp-content/themes';

with

$root = get_theme_root();

You will also want to replace the root on line 83:

$template_root = substr($_SERVER['SCRIPT_FILENAME'],0,-19).'wp-content/themes/'.$template.'/';

with:
$template_root = get_theme_root() . '/' .$template.'/';

and on line 91
$make = $export->add($add, PCLZIP_OPT_REMOVE_PATH, substr($_SERVER['SCRIPT_FILENAME'],0,-19).'wp-content

with
$make = $export->add($add, PCLZIP_OPT_REMOVE_PATH, get_theme_root() );

I would also recommend using the built-in version of class pclzip found in wp-admin/includes/class-pclzip.php

Replace require_once WPCT_PATH.'lib/pclzip.lib.php'; with require_once '/includes/class-pclzip.php'; on 74. This will allow you to remove the included library.

There is also a typo on line 80 permissons instead of permissions

Hope this helps!

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