Eddy,
I dont know which component of Avast blocked the download, but part file in Virus Chest now deleted and submitted to lab was labelled as infected by:
"Win32:EVOGen[Susp]"
I also attempted to install from memory stick. Blocked also stating "Win32:EVOGen[Susp]" as the villain.
I have also tried with DeepScreen OFF and reputation services OFF but to no effect.
Ed