UNDO command not working

[alexa]

Hi
I recently installed AutoCAD Electrical 2016 on Windows 11 (64-bit).
The main issue I’m facing is that the UNDO command has to be manually enabled every time I open a drawing or restart AutoCAD.

It seems the only fix might be a complete uninstall followed by a fresh installation.

My concern is whether I’ll be able to re-activate my permanent license after reinstalling. According to an email from Autodesk:

On March 10, 2025, Autodesk will no longer provide support or activation requests for 2015 and 2016 software versions. At this same time, we will also be retiring the License Transfer Utility.

Can anyone confirm if reinstalling the software would trigger a re-activation process? Or help me with the UNDO command fix?

thanks

[arshdeepsingh404]

Hello @alexa 

This could be version specific problem. I am not sure if reinstalling will keep the permanent license.
The other option could be try only resetting AutoCAD Electrical to defaults.

I will tag @jaya_priya_ramasamy here, Maybe she can help us understanding how permanent licensing works.

Alternatively, you could try is using an AutoLISP program that enables UNDO command.

(defun c:EnableUndo ()              ; Define command EnableUndo
  (command "UNDO" "C" "ALL")        ; Call UNDO command with "C" option for control and set to track all changes
  (princ "\nUNDO enabled.")         ; Feedback to user
  (princ)                           ; Exit quietly
)

(c:EnableUndo)                      ; Call the function to enable undo

On step 8 of the attached PDF, I explain how to add this to APPLOAD startup suite so this program get automatically gets loaded and called every time a new drawing opens.

There are other ways to automatically run lisp files as well like the acaddoc.lsp

https://help.autodesk.com/view/OARX/2024/ENU/?guid=GUID-FDB4038D-1620-4A56-8824-D37729D42520