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 vcredist2015 from the command line, run the following command:
choco install vcredist2015 --version 14.0.24212.20160825 --source https://choco.csdesiles.qc.ca:80/nuget/ChocoCSI/
Description
The Visual C++ Redistributable Packages install run-time components of Visual C++ libraries. These components are required to run C++ applications that are developed using Visual Studio 2015 and link dynamically to Visual C++ libraries. These package can be used to run such applications on a computer even if it does not have Visual Studio 2015 installed. These packages install run-time components of these libraries: C Runtime (CRT), Standard C++, MFC, C++ AMP, and OpenMP.
The installation on Windows 8.1 or Windows Server 2012 R2 fails when you do not install the update KB2919355