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西門子下載下了來后解壓有三個(gè)程序分別為microwin     s7exp      tdpaneled，然后安裝STEP7-MicroWIN_V40_SP8時(shí)老是顯示unable to locate a valid executalbe for update ,you must select the directory where your previous version of micro/win or micro/dos is located？請問該怎么安裝