各位前辈们!我遇到了一个小小的问题,我在安装SIEMENS S7-200的编程软件时,安装到一半的时候,电脑里面跳出这样的一条信息!我看不懂,想请高人指点!信息如下: Unable to locate a valid executable for update,you must select the directory where your previacs version of Micro/Dos is located! 我看不懂是什么意思,按照提示给于确定,但是后面又出来了一条信息! Still unable to locate a valid executable for update or current version already installed installation aborted ! 就这些信息,我重复的安装了好几次,还是不行啊!请高人指点!谢谢!