If all else fails on native Windows 7:

(represented by a green traffic light icon) as an Administrator. Regional Settings : Ensure your Windows Regional Settings are set to English (United States)

Summary

A mismatch between your Hardware ID and the license file will trigger the E0209 error.

: Go to the RegSettings folder in your installation package. Run RegSettings_x86.reg for 32-bit systems or RegSettings_x64.reg for 64-bit systems.