High-quality tuning software is rarely free. The official ECU Flasher by Alex requires a (a physical hardware key) to function. When users search for a "free download," they are usually looking for a "cracked" version that bypasses this hardware requirement.
For a reliable and legal experience, you should purchase the software and modules directly from authorized distributors or the Official Developer Site (note: site may be in Russian). Romraider ecu flash issue with 07 wrx? - Facebook ecu flasher by alex free download
Given the potential risks associated with ECU modification, proceed with caution and ensure you have a good understanding of what you're doing. If you're not experienced, it might be wise to seek professional help. High-quality tuning software is rarely free