Installing Unity 2017 mac failed

Hi, I wanted to install Unity 2017.1.0f3 in my MacOS Sierra. In the wizard when I try to install it gives me the errro "the installation failed" . I downloaded the file from unity archive section and via torrent. My mac specs are macOS Sierra,4gb ram, core i5 cpu. I have previously installed every version of unity without any problems.
I'll appreciate if you can help me wth this.
Thanks