This package appears to have a custom/proprietary license agreement, and ProGet cannot be automatically determine the license type. You'll need to assign a license type to the URL to allow or block packages with this license.
Usage Instructions
To install KB2919442 from the command line, run the following command:
choco install KB2919442 --version 1.0.20160915 --source https://choco.csdesiles.qc.ca:80/nuget/ChocoCSI/
Description
The servicing stack includes the files and resources that are required to service a Windows image. This includes the Package Manager executable, the required servicing libraries, and other resources. The servicing stack is included in all Windows installations. The update fixes some issues.
On systems other than Windows 8.1 or Windows Server 2012 R2, this package installs successfully, but does nothing.
This update is required to install Visual Studio 2015 on Windows 8.1 or Windows Server 2012 R2.