Upgrade error from v4.5.8 to 4.6.11
Jitendra's comment is correct - it should be posted as an answer!

As for your second error, that's caused by skipping the first error.  The SQL for 4.6.alpha1 includes the command to create the "civicrm_recurring_entity" table.  When you skip the rest of the 4.6.alpha1 SQL, you're creating the circumstance that leads to the second error.