Plaese, how can i download all font at a time.

you can't.
why would you need to do that?

Follow up totally unrelated question:

"How do I create my own font website"

lol

lol

Or maybe OP doesn't have an internet connection on a daily basis, and wants more than what he currently needs. Would make sense too.

Anyway, it's impossible.

maybe u need google some big "font pack"