Can't install Horizon

Hello,

everytime i try to install Horizon it gives me this crash report:
“The installer was unable to acces the server. Please try again later.”

I turned off my antivirus (Avast) and ran it as an administrator but it wont work, i keep getting this message.

Can somebody help me?

Go ahead and try this installer: https://www.horizonmb.com/client/v2/Horizon.Setup.v2.8.1.1.exe