Hi, the only way I see without running OpenDCL command is to search the Windows registry whether the key HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\R<ReleaseNumber>\ACAD-<ReleaseKey>\Applications\OpenDCL\Commands exists and the files "C:\Program Files (x86)\Common Files\OpenDCL\OpenDCL.x64.<ReleaseNumber>.arx" exist.
Regards, Fred