prs/prs.desktop/Utils/DownloadSupportAppWindow.xaml

<Window x:Class="PRSDesktop.DownloadSupportAppWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:local="clr-namespace:PRSDesktop"
        xmlns:wpf="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
        mc:Ignorable="d"
        Title="DownloadSupportAppWindow" Height="450" Width="800">
    <Grid 
        Margin="5">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Label
            Content="Paste URL:"
            Grid.Row="0"
            Grid.Column="0"
            Margin="0,0,5,0"
            HorizontalContentAlignment="Center"
            VerticalContentAlignment="Center"/>
        <TextBox
            x:Name="URL"
            Grid.Row="0"
            Grid.Column="1"
            VerticalContentAlignment="Center"/>
        <Button
            Content=".."
            Grid.Row="0"
            Grid.Column="2"
            Padding="10,0"
            Margin="5,0,0,0"
            Click="Download_Click"/>
        <wpf:WebView2
            x:Name="Browser"
            Grid.Row="1"
            Grid.Column="0"
            Grid.ColumnSpan="3"
            Margin="0,5,0,0"
            NavigationStarting="Browser_OnNavigationStarting" />
    </Grid> 
</Window>