Could not load file or assembly 'System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

[mohamedebrahimselema]

open confige file
update this line
newVersion="4.2.0.0"
to
newVersion="4.0.0.0"/>