If you have tried all 12 methods and the error persists, your downloaded archive is definitively broken. Delete it, re-download from a reputable source using a torrent client, and the problem will vanish.
Large decompressions can exceed physical RAM, requiring more virtual memory. how to fix unarc dll returned an error code 1
Ensure your target drive (and C: drive for temporary files) has significant free space. Detailed Troubleshooting Report 1. System Permission & Security Adjustments If you have tried all 12 methods and