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.
To install EntityFramework from the command line, run the following command:
nuget install EntityFramework -Version 4.1.10331.0 -Source https://nuget.sapec.md/nuget/Sapec/
To install EntityFramework from the Package Manager Console within Visual Studio, run the following command:
Install-Package EntityFramework -Version 4.1.10331.0 -Source https://nuget.sapec.md/nuget/Sapec/
For projects that support PackageReference, copy this XML node into the project file to reference the package.
<PackageReference Include="EntityFramework" Version="4.1.10331.0" />
DbContext API and Code First workflow for ADO.NET Entity Framework.