Where are the "ConfigAndLog" and "templates_c" directories?
The two directories are found side-by-side.  The location varies by CMS; see below.  Note that you'll need access to your server's file system.  If you have FTP/SFTP/SSH access, you can use that.  If you have a control panel, check for a &quot;File Manager&quot; plugin:

Drupal: &lt;drupalroot&gt;/sites/default/files/civicrm/
Joomla: &lt;joomlaroot&gt;/media/civicrm/
WordPress: &lt;wordpressroot&gt;/wp-content/uploads/civicrm/
WordPress (old): &lt;wordpressroot&gt;/wp-content/plugins/files/civicrm/

Any CiviCRM version 5.29 and later will never have the &quot;old&quot; location.


Backdrop: &lt;backdroproot&gt;/files/civicrm/