simple-nuget-server | A very simple PHP NuGet server | DevOps library

Forgive what must be a very simple oversight on my part but I simply cannot get this to work as expected.

I am building a .NET Framework 4.6 Class Library that needs to be downloaded by other applications from a private nuget repository. Here is my process:

1. I have a test project, ConsoleApp5. It has a simple main function in it.
2. I download my NuGet package, MyPackage (right click on project and click Manage NuGet Packages, select appropriate repo and package, click install.)
3. I run my test. In this case, I'm simply trying to instantiate a class, something not difficult. I'm getting an error about class accessibility.
4. Back in MyPackage, I replace all instances of the word protected with public. I add a new class as well by right-clicking on the project, selecting Add Item, targeting a class and giving it the name TestClass.
5. I go to Project > MyPackage Properties... > Application (tab) > Assembly Information, and I manually update the version patch number by one. So now it is 1.0.5.
6. I go to the project directory in the Developer Command Line and run the following command: C:\Users\jptak\Downloads\nuget.exe pack -Version 1.0.5
7. Then I run the following command to push the update (Success message: Your package was pushed.): C:\Users\jptak\Downloads\nuget.exe push MyPackage.1.0.5.nupkg MySecretCodeGoesHere -src http://my.nuget.server.goes.here.com
8. I go back to ConsoleApp5, Manage NuGet Packages, see the update in the appropriate package, and click the update arrow. The download completes and the new version number is there.
9. I go to use new classes or check that old errors are fixed and all of my tests fail. TestClass is not there.

This leads me to believe that the code I am writing is not making it to the NuGet server. Does anyone know what I am missing from this process to make the most recent version of the code get updated on the server?

This process is foreign to me as I am not a .NET developer (I work with PHP mostly).

Here are some more pieces of information about my IDE settings:

• In Build > Configuration Manager... > Debug has been switched to Release
• I have tried building, rebuilding, and cleaning my project. I haven't seen that any of these processes has had any effect on the code being pushed at all.

Here is the code from my ConsoleApp5: