Instead of a clean reinstall, perform an In-Place Upgrade (install the same version over itself). Autodesk's installer will detect missing or corrupt .dbx files and replace them without losing your custom settings. This is often the best middle-ground solution.
The "Fatal Error" referencing acismobj20.dbx (or similar modules like acismobj24.dbx autocad fatal error acismobj20dbx best
Prepare this data before contacting:
"Fatal Error: AutoCAD Error Aborting" while working in AutoCAD Products 10 Mar 2026 — Instead of a clean reinstall, perform an In-Place
This article explains what this file is, why it crashes your session, and provides a step-by-step guide to resolve it permanently. Instead of a clean reinstall