Keep an eye on Sony's subscription service. While Stellar Blade isn't currently included, many first-party Sony titles eventually make their way to PlayStation Plus Extra or Premium tiers. If you already subscribe, you might be able to play it at no additional cost when it's added to the catalog.
If you ignore the warning above and search for a torrent or direct download, you are walking into a digital minefield. Here is what is actually hiding behind those links: Stellar Blade PC Download Free
Download the game safely through the official Steam launcher. Conclusion: Supporting the Creators Keep an eye on Sony's subscription service