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Ahmed,
Did you mean install a lower version of AutoCAD? We cannot do this.
We have generally found that turning "Hardware Acceleration" off causes more harm than good. Just now in a test of a large 110MB model in Plant 3D 2018, having it set "off" resulted in bad performance and objects not displaying using 3DOrbit. With it "On", I was able to orbit without issue. The last sentence in this statement by Autodesk is curious in this regard:
Per: https://knowledge.autodesk.com/certified-graphics-hardware
Cards/drivers listed on this page have been tested by card vendors and/or product teams, results have been reviewed by Autodesk product teams. The tests verify that that hardware supports the product features. Cards/drivers that are not listed may still work with the product, but Autodesk has not yet received/verified test results.
Perhaps we have a card that "still works with the product"? It does appear so. I seem to recall some years ago, doing a test on a machine and found that AutoCAD automatically turned "Off" hardware acceleration. Do you think AutoCAD would do that? Perhaps the reason it is left "On" in our environment is because it deems our card to be good enough, albeit not "certified"?
Any thoughts?
Regards