Failed opening install.inc' when upgrading Drupal 7.x core with Drush 7.x I have Drush 7.x installed and when I run 'drush up', on a Drupal 7.x codebase, I get the following error:

Drush command terminated abnormally due to an unrecoverable error.
[error]Error: require_once(): Failed opening required '/home/user/public_html/core/includes/install.inc'


It seems like Drush 7.x may be looking for Drupal 8.x file structure. How should I be running this command?
I managed to get it fixed after tracking the issue in drush 7, this is caused as you said by trying to load install.inc as Drupal 8 folder structure while you have Drupla 7 structure

I simply modified DRUSH_ROOT/commands/core/core.drush.inc line 1120

require_once DRUPAL_ROOT . '/core/includes/install.inc';


to be like 

require_once DRUPAL_ROOT . '/includes/install.inc';


I hope this help you.