No. Free legal downloads do not exist for this show. However, many libraries offer DVD/Blu-ray rentals, and you can rip those for personal use (legal gray area depending on region).
Spartacus: Blood and Sand is a historical drama television series that aired from 2010 to 2011. The show was a critical and commercial success, and it has gained a large following worldwide. This report provides an overview of the web series and options for downloading Spartacus: Blood and Sand. spartacus blood and sand web series download