Sorry for the super noob questions but when you say:
Depending of your Raspberry Pi version, download one of the archives arm6 - (Raspberry Pi A, A+, B, B+, Zero) arm7 - (Raspberry Pi 2, 3)
Are you saying to download an archive from here:
https://archlinuxarm.org/about/downloads ?
And then when you say:
Open the folder from the console and type (example with arm7)
Are you referring to the folder of the downloaded archive? Or are you referring to a folder in the repo?