Open TIA Portal V12. Go to Help > Info . You should see: "Version V12 SP1 Update 5" . If you see only "V12 SP1" without a build number, you are running the buggy version.
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If your goal is to open an old V12 project, consider these options: Descarga del SIMATIC WinCC V12 + SP1 Trial - ID - Support Open TIA Portal V12
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