西門(mén)子下載下了來(lái)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(qǐng)問(wèn)該怎么安裝