First off, Welcome to the Forum limln !
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limln wrote: ↑Tue Jul 13, 2021 3:56 am
the system is always telling me the software/doc is not safe,so i cannot download it.
That must be a setting in your setup of your MAC-OS.
I have no knowledge in MAC at all, but in windows, you will get a similar fail and warning. In that case you need to scroll way out to the right where there is a 'hidden' button that let you Download anyway:
You should also log in as user with full rights -eg log in as what is similar to Administrator in Apple OS, if that exists 🤫❓