This is part of the Air Installer, a download manager which bundles applications with offers for additional 3rd party software, mostly unwanted adware, and may be installed with minimal consent. Newtonsoft.Json.dll is the assembly provides support for JSON parsing for .NET applications and is recompiled by Secure Installer Inc. The module Newtonsoft.Json.dll, “Json.NET .NET 2.0” by Secure Installer Inc has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. Although a detection has been made for this resource, it is generally a commonly distributed 3rd-party library and is typically safe by itself.