Because Horizon 3 was the first in the series to hit PC, many users incorrectly assume the earlier titles (1 & 2) also made the jump. When they see "Forza Horizon 2" on a download site, they often click without verifying the platform.
If you're looking for a similar gaming experience, you might consider other racing games available on PC, such as:
Downloads labeled as "Full PC Games" for titles that were never ported are often dangerous. Common risks include: