. . . . download an audio function. When I click YES, it says it cannot be done . . . .
We need more information to help diagnose the issue you are having:
What is the full name and version number of the video editor you are using, and what is the full error message?
It may also help if you give us the specification of your computer system including Windows version, see this topic for what is required, and please quote processor and graphics card make/model in full, and also what monitor/screen resolution(s) you are working with if this is a laptop.
I would suggest you put this information in your profile signature so we do not have to keep asking for it.