The word "updated" is meaningless here. The last official update to Forza Horizon 1 was in 2013. No pirate site can magically create new performance patches for an emulated game.
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Your best move: Spend $15 on a single month of Xbox Game Pass Ultimate and stream Forza Horizon 1 via Xbox Cloud Gaming. You will be playing legally within 10 minutes, with no viruses, no frustration, and full cloud saves. Alternatively, save up for a used Xbox Series S—it plays FH1 beautifully in backwards compatibility. The word "updated" is meaningless here
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Stay safe, and keep on driving.
Forza Horizon 1 runs on a proprietary engine built for PowerPC architecture (Xbox 360). Porting it to x86 Windows would require:
Microsoft has shown no interest in remastering Horizon 1, as they are focused on Horizon 5 (with 20+ million players) and the upcoming Fable reboot. Any claim of an "updated PC download" is therefore a hoax.