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已經安裝了STEP 7-MicroWIN V4.0，但是升級不了提示錯誤，達人幫幫忙呀
Unable to locate a valid executable for update,you must select the directory where your previous version of Micro/WIN or Micro/DOS is located

參考：http://www.sxzp618.com.cn/read-gktid-30905.html