This filename suggests a custom content (CC) or a fake/pirated DLC package for The Sims 4 . The Sims 4 does not have an official DLC code “SP59” — the last official Stuff Pack was “SP18” (My First Pet Stuff), and Kits use different naming (e.g., “Kit001”). This file is likely unauthorized third-party content (possibly a mod, a build bundle, or a malicious file masquerading as a DLC).
Would you like a list of that add hidden lots or secret-themed build items instead? Sims4-DLC-SP59-Secret-Sanctuary-Kit -2-.zip