I have a client site running version 4.6.5. I need to upgrade their Drupal install to make use of some new modules that do not work with their current version. I would like to upgrade to 4.7.5.
I tried going directly from 4.6.5 to 4.7.5 but that produced a large list of SQL errors and failed upgrade messages.
I restored the database and php files from backups.
I then tried going from 4.6.5 to 4.6.11. That seemed to work. I then tried upgrading from 4.6.11 to 4.7.5 but that produced a large list of SQL errors and failed upgrade messages.
Again I restored the database and php files from backups.
I then tried upgrading to each individual revision step by step, all the way from 4.6.5 to 4.7.5. When I get to the 4.6.11 to 4.7.0 upgrade I get a large list of SQL errors and failed upgrade messages:
* user warning: Table 'search_total' already exists query: CREATE TABLE search_total ( word varchar(50) NOT NULL default '', count int(10) unsigned default NULL, PRIMARY KEY word (word) ) in /home/greg/dev/drupal/includes/database.mysql.inc on line 120.
* user warning: Can't DROP 'path'; check that column/key exists query: ALTER TABLE blocks DROP path in /home/greg/dev/drupal/includes/database.mysql.inc on line 120.