In the Administrator Command Prompt, type the following (adjust the path to your version):
: Running older, 64-bit versions of AutoCAD LT on newer Windows updates. Corrupt Installation : Missing or damaged program files. autocad fatal error acismobj20dbx best
The acismobj20.dbx error is frequently linked to how AutoCAD interacts with your GPU. Forcing the software to use a specific power mode or disabling acceleration can bypass driver conflicts. In the Administrator Command Prompt, type the following
AUDIT (yes to fix errors) -ACISOUT (export all ACIS entities to .sat) ERASE → ALL → Remove (then paste from original) In the Administrator Command Prompt