[Plugin: WP-Database-Optimizer-Tools] File Not Found

I like your db optimizer. I am a professional writer and artist and as such make many revisions. So I was looking for way to remove the 30-40 revisions from my db and your tool is just the ticket. Pero cuando hago una copia de seguridad, encuentro problema de 404. Como corecto este problema?

http://wordpress.org/extend/plugins/wp-database-optimizer-tools/