Why i can’t download horizon mb ?
Can you be more specific please? What download link are you using, and where exactly does it redirect you?
oh lol, really ? Ok… 
…
My computer have internet,
With my internet I go on horizon mb : https://www.horizonmb.com/
I click here :
The link give me this : https://www.dropbox.com/s/2j6fuc9sdn...9.website?dl=0
After this, i don’t have Horizon mb. Does it lacks precision ? 
Thanks ! 
Try downloading from this link: https://www.horizonmb.com/client/v2/latest.php
It should download, and install properly.
Ohhhh, Thanks You man… this is three weeks as I try ! 
8)
The download link are you using is not working. Try to download it from https://errorcode0x.com/resolve-steam-error-code-80/ with a good internet connection.