Make sure you are not grabbing the "N" (No Media Player) or "KN" (Korea-only) variants. The Single Language SKU is distinct from these.
The Media Creation Tool currently serves (Build 19045). Even if you use older command-line tricks with the MCT, you cannot roll back to 1507.
I recently needed to find the for an offline industrial kiosk. The requirements were strict: No bloat, no Windows 11 prompts, no multi-language overhead, and based on the original 1507 (or 10240) codebase.