Multiple errors when upgrading from Drupal 6 & Similar v1.2 -> Drupal 7 & Similar 7.x-2.0 beta 1

The first error I received upon running update.php was for an undefined method "update_sql". The "similar.install" file referes to this method in 2 places, and I was able to work around this error by replacing it with "db_query".

The next error I received was that there was no such table as drupal.blocks. This I was able to fix by wrapping those 2 SQL queries in the following conditional:

if ( db_table_exists('blocks') ) {
...
}