If the error persists, your Windows Installer service might be unregistered: Open the as an administrator. Type msiexec /unreg and press Enter . Type msiexec /regserver and press Enter . Restart your computer and try AutoCAD again. If you'd like, let me know:

Disrupted registry paths from a previous, incomplete uninstallation. Step-by-Step Solutions to Resolve Error 2602

Ensure you have ample free space on your C: drive before updating. Conclusion

Outdated .NET Framework versions or missing Microsoft Visual C++ Redistributables can trigger this error. Step-by-Step Solutions to Fix Error 2602 1. Run the Installer as Administrator

If 2602 occurs, it often means the C:\Windows\Installer folder is missing the necessary MSI database file.

Ensure your computer's graphics drivers are up-to-date, as outdated drivers can cause Internal Error 2602.