Fatal Error on upgrading to Drupal 4.5.1 resolved

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Thanks to TDobes note on the Drupal forums, I got past a fatal error after upgrading to Drupal 4.5.1 from 4.3. 

"Fatal error: Class theme_example: Cannot inherit from undefined class basetheme..."

It turns out I had not read the instructions:

You need to remove ALL the old drupal files, then unpack the new files into the drupal directory.

Then it works, magically!