Cake NuGetRestore always wants MSBuild14? - cakebuild

Question

While trying to rig up a solution to build with Cake v0.19.1 on a machine that has only ever known Visual Studio 2017, I can't seem to get NuGetRestore to accept a setting of MSBuildVersion = NuGetMSBuildVersion.MSBuild15.
Is there some magic step to getting a specific MSBuild version into NuGetRestore that I am missing?
Output
...
========================================
RestoreNuGet
========================================
Executing task: RestoreNuGet
Failed to load msbuild Toolset
Could not load file or assembly 'Microsoft.Build, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
An error occurred when executing task 'RestoreNuGet'.
Error: NuGet: Process returned an error (exit code 1).
Trimmed-down build.cake
var target = Argument("target", "Default");
var solution = "./some-random.sln";
Task("Default")
.Does(() => {
NuGetRestore(
solution,
new NuGetRestoreSettings {
MSBuildVersion = NuGetMSBuildVersion.MSBuild15,
}
);
});
RunTarget(target);
Update: getting NuGet v4
Per #devlead's answer, I pointed the build.ps1 file at the v4.0.0 of NuGet and got this output.
Cannot find the specified version of msbuild: '15'
An error occurred when executing task 'RestoreNuGet'.
Error: NuGet: Process returned an error (exit code 1).
In my full build.cake, I use vswhere for later MSBuildSettings which I can get to dump out the MSBuild path it found (and I confirmed that exe exists in Explorer).
C:/Program Files (x86)/Microsoft Visual Studio/2017/Enterprise/MSBuild/15.0/Bin/amd64/MSBuild.exe

Answer 1

What you could try is to use the MSBuild alias with the restore target, latest version of MSBuild should have build in NuGet support.
MSBuild(
"./some.sln",
configurator => configurator.WithTarget("restore"));

Answer 2

Make sure you're using the latest version of NuGet.exe, currently it's
v4.0.0 which is the latest version, but you can also see a list of available at https://dist.nuget.org
If you're using the default build.ps1 you could modify it to always download specific version of NuGet.exe
You can do this be remove the Test.Path parts - so it won't look for nuget.exe any where else but your tools folder.
Then change the download uri to not use latest stable (currently v3.5.0) but a specific version by in build.ps1 changing
$NUGET_URL = "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe"
to
$NUGET_URL = "https://dist.nuget.org/win-x86-commandline/v4.0.0/nuget.exe"
will ensure you always download v4.0.0 of the exe.
It's also possible with a little PowerShell to verify correct version in tools, example
if ((Get-ChildItem $NUGET_EXE `
| % VersionInfo `
| % ProductVersion `
| ? { $_ -eq '4.0.0' }|Measure-Object).Count -eq 1)
{
'Correct version'
} else {
'Incorrect version'
}