If all else fails, use Autodesk’s official Uninstall Tool to remove the problematic installation without needing the MSI. For repairs, consider reinstalling AutoCAD fresh using a newly downloaded copy from Autodesk.
When searching for you may find many third-party websites claiming to offer the file for free. Avoid these. Downloading .msi files from unofficial sources is a major security risk, as these files can be injected with malware or viruses. Always get your files directly from the Autodesk website. Conclusion acad.msi download
If prompted to locate acad.msi :