If after upgrading SmartPlant Instrumentation, you have 2 different versions of AutoCAD installed on the same machine, to enable SmartPlant Instrumentation to use the correct version of AutoCAD you must do the following:
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On the Preferences dialog box in SmartPlant Instrumentation, specify the CAD file locations for the required AutoCAD version.
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Run the required version of AutoCAD the first time from outside SmartPlant Instrumentation.
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Close and reopen SmartPlant Instrumentation to be able to run AutoCAD from SmartPlant Instrumentation.