Plain WPF sample doesn't work - Cef::Initialize() failed

[WrongBit]

Hi! I have Win7x64, FW4.8, VS2019
I tried to create simple example(AnyCPU + not "prefer 32 bits"), but w/o any clownish nugets - we have strict policy to not deal with untested updates.
I unpacked all nuget packages and got x64 DLLs. Then I referenced DLLs in my WPF project + added necessary native libs (which come with cef.redist.x64.88.2.4.nupkg ). XAML code is quite simple:

<Window x:Class="ChromeEmbFrw.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:cef="clr-namespace:CefSharp.Wpf;assembly=CefSharp.Wpf"
        Title="MainWindow" Height="450" Width="800">
    <cef:ChromiumWebBrowser Name="brwMain" />
</Window>

And when I start application, got this error:

Cef::Initialize() failed
at CefSharp.Wpf.ChromiumWebBrowser.NoInliningConstructor() in 
C:\\projects\\cefsharp\\CefSharp.Wpf\\ChromiumWebBrowser.cs:line 530
at CefSharp.Wpf.ChromiumWebBrowser..ctor() in C:\\projects\\cefsharp\\CefSharp.Wpf\\ChromiumWebBrowser.cs:line 451

For me it's quite strange to see so unprofessional, obscure reports like "failed" - I have no idea what exactly going wrong.
Of course I tried to inspect ChromiumWebBrowser.cs:line 530, but found nothing, but empty line:

IsVisibleChanged += OnIsVisibleChanged;
// line 530
ToolTip = toolTip = new ToolTip();

Hardly assigning handler was reason, but anyway I cannot debug it.
This is list of binaries I got after build (and added from redist):

CefSharp.BrowserSubprocess.Core.dll
CefSharp.BrowserSubprocess.Core.pdb
CefSharp.BrowserSubprocess.exe
CefSharp.BrowserSubprocess.pdb
CefSharp.Core.dll
CefSharp.Core.pdb
CefSharp.Core.Runtime.dll
CefSharp.Core.Runtime.pdb
CefSharp.Core.Runtime.xml
CefSharp.Core.xml
CefSharp.dll
CefSharp.pdb
CefSharp.Wpf.dll
CefSharp.Wpf.pdb
CefSharp.Wpf.xml
CefSharp.xml
ChromeEmbFrw.exe   - my app
ChromeEmbFrw.exe.config
ChromeEmbFrw.pdb
chrome_elf.dll
icudtl.dat
libcef.dll
snapshot_blob.bin
v8_context_snapshot.bin

I debugged everything I could (I had no necessary files), but now it's complete set of binaries and I have no idea WHAT ELSE can be wrong. So I need help please what to do. Ideally if people takes "spaghetti", which produces error and UNHIDE internal problems - no any reason to hide it even from final user! We always must know what's wrong.
Thanks!