A: No. Spartacus was shot digitally between 2010 and 2013, primarily in 1080p. There is no official 4K release, so any "4K" download claiming dual audio is an upscaled fake.
A: If you watch files via a USB drive on a Smart TV, many TVs do not allow you to change audio tracks easily. You must use a PC program called MKVToolNix to "remux" the file: Open the file, highlight the preferred Hindi track, and move it to the top of the list. This makes it the default track #1. Spartacus All Season Dual Audio Download
While third-party "download" sites often carry security risks, several official platforms allow you to watch the series with multiple language options and even through their apps: Watch Spartacus highlight the preferred Hindi track