Windows 7 32-bit can only address (often ~3.2–3.5 GB usable). FIFA 15, especially with high settings, can consume nearly 2.5–3 GB of RAM. Add background processes, and you risk crashes, stuttering, or the game refusing to launch.
In 2015, EA offered a 35-day trial of FIFA 15 on Windows 7 via Origin Game Time. Users with 32-bit systems could play for 35 days with restrictions. The keyword may be a remnant of that promotion. fifa 15 windows 7 32 bit 35
If you are currently on a 32-bit version of Windows 7 and want to play FIFA, consider these options: Windows 7 32-bit can only address (often ~3
FIFA 15 on Windows 7 32-bit: Can it Run Smoothly? especially with high settings