If you still see Error Code 12 after all steps, the source files are truly corrupted. Re-download the torrent or repack using a stable internet connection (avoid Wi-Fi dropouts) and always perform a re-check in your torrent client before installing. Have you fixed Error Code 12 with another method? Let others know in the comments below.
Turn off Real-time Antivirus + Run as Admin + Windows 7 Compatibility Mode. unarc dll error code 12 download 64-bit
specifically translates to: "Decompression failure due to corrupted archive or insufficient memory." If you still see Error Code 12 after