Reviewers on Reddit's CrackSupport and DODI's official troubleshooting page suggest these "tried and true" solutions:
If none of the above work, your background processes (RGB software, overlays, browser extensions) might be interfering with the CPU-intensive decompression. Restart Windows in . unarcdll error code 12 dodi repack
A more advanced step is to test your RAM. Faulty memory is a common cause of decompression errors. Use the built-in tool (search for it in the Start menu) to check your RAM for errors. If it finds any, you may need to replace the faulty RAM stick(s). your background processes (RGB software