Hi Fatima,
until a few minutes ago I had run into the same difficulties: course creators couldn't use the templates, unless they were managers, too.
My solution: I have, as an administrator, redefined role-capabilites for course creators. Where do you find the necessary capabilities? You find them in the unzipped plugin file. The "index.php" for instance reads:
$capabilities = array(
'moodle/backup:backupcourse',
'moodle/backup:userinfo',
'moodle/restore:restorecourse',
'moodle/restore:userinfo',
'moodle/course:create',
'moodle/site:approvecourse',
);
I had to adjust "userinfo" and "approvecourse" to make the plugin work for course creators.
Hope this helps!
Regards,
jgv