You don’t need Deluxe/Premium unless you want specific extra aircraft. The base game has dozens of planes and all major airports.
If you saw a “Microsoft Flight Simulator 2024” download link somewhere, — it’s likely a scam or malware.
Instead, use one of the legitimate low‑cost or free methods:
You can earn Microsoft Rewards points by searching with Bing, completing quizzes, etc., then redeem them for Xbox Game Pass subscriptions — effectively playing MSFS for free after some daily effort.