A third option appeared between them:
Before tweaking settings, ensure your game files are not corrupted. A single missing byte can cause a decompression error. Open your torrent client (qBittorrent, uTorrent, etc.).
By applying these solutions—particularly increasing paging files and capping CPU usage—you should be able to bypass the Unarc.dll -12 error and successfully install your DODI repack.
Add both the and your target installation folder to the exclusions list.
If your system lacks a large physical pool of RAM or runs short on operating memory during a 100GB+ extraction, manually scaling up the virtual memory pool allocates stable disk space to handle overflow.
Are you getting the error at a specific percentage (e.g., 50%)? Share public link