To fix the unarc.dll error code 6 when installing , you primarily need to address archive corruption or memory issues by increasing virtual memory clearing temporary files renaming installation folders
Are you installing from a or a downloaded setup file ? To fix the unarc
Right-click the setup.exe and select Run as administrator to ensure the installer has permission to write files to your drive. Windows: set environment variables TEMP and TMP to
If the issue persists, your system's core decompression files might be missing or corrupted: Disable all antivirus and Windows Defender
D:\FIFA13 (avoid spaces or special characters).: Use the Disk Cleanup utility to delete junk and temporary files that might be clogging the installation process.