Werry slow downloading in launcher

Hy! I installed Epic games launcher in my computer(i5 6400/8GB RAM). But when I try to install Unreal Engine, up to 20-30% is all good, but after this my download speed falls to zero.

I tried:

  • Reseting router.
  • Start launcher as administration
  • Change my antivirus
  • Delete my antivirus
  • Reinstall my computer.

But nothing changes.

What is the solution?
Thank you for the answers, and sorry for bad English.

I don’t know why, but I reinstalled my PC again, and it’s work:D