I see you're looking for a way to access Spartacus Season 1. Given the copyright and legal issues surrounding direct downloads, I'll guide you on some legitimate options to consider:
Vudu frequently runs sales on Starz catalog titles. You can often pick up the Spartacus: The Complete Series bundle for under $40, which includes Season 1, Gods of the Arena, Season 2 (Vengeance), and Season 3 (War of the Damned).
If you want a true digital download for offline viewing, Amazon offers the complete Season 1 in HD. Once purchased, you can download episodes to the Prime Video app on your phone, tablet, or PC. The cost is typically $14.99 - $24.99 for the SD/HD versions. You own the license indefinitely.
For true collectors, the Blu-Ray box set of Season 1 includes:
Buying used Blu-Rays on eBay is often cheaper than a digital license.
A common mistake occurs when downloading. After Season 1, Starz produced Gods of the Arena (6 episodes) as a prequel to allow Andy Whitfield time for cancer treatment. Gods of the Arena focuses on Gannicus and Batiatus’ father. It is not Season 1, but it is meant to be watched between Season 1 and Season 2.
If your Spartacus Season 1 complete download folder contains only 13 episodes, you are missing the prequel. If it contains 19, you have the prequel included.