diff --git a/src/Eto.Mac/Forms/Controls/WKWebViewHandler.cs b/src/Eto.Mac/Forms/Controls/WKWebViewHandler.cs
index 0501a7f888..844aec4d2b 100644
--- a/src/Eto.Mac/Forms/Controls/WKWebViewHandler.cs
+++ b/src/Eto.Mac/Forms/Controls/WKWebViewHandler.cs
@@ -22,14 +22,8 @@
 
 namespace Eto.Mac.Forms.Controls
 {
-	[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
-	public delegate void Blar(IntPtr block);
-
 	public class WKWebViewHandler : MacView<wk.WKWebView, WebView, WebView.ICallback>, WebView.IHandler
 	{
-		static readonly Selector selIgnore = new Selector("ignore");
-		static readonly Selector selUse = new Selector("use");
-
 		public override NSView ContainerControl { get { return Control; } }
 
 		public wk.WKWebViewConfiguration Configuration { get; set; } = new wk.WKWebViewConfiguration();
@@ -315,7 +309,21 @@ public void ShowPrintDialog()
 			if (printOperation != null)
 			{
 				// RunOperation() doesn't work..
-				printOperation.RunOperationModal(Control.Window, Control, new Selector("printOperationDidRun:success:contextInfo:"), IntPtr.Zero);
+				var printHelper = new PrintHelper();
+				printOperation.RunOperationModal(Control.Window, printHelper, PrintHelper.PrintOperationDidRunSelector, IntPtr.Zero);
+			}
+		}
+
+		class PrintHelper : NSObject
+		{
+			public static Selector PrintOperationDidRunSelector = new Selector("printOperationDidRun:success:contextInfo:");
+
+			public bool Success { get; set; }
+
+			[Export("printOperationDidRun:success:contextInfo:")]
+			public void PrintOperationDidRun(IntPtr printOperation, bool success, IntPtr contextInfo)
+			{
+				Success = success;
 			}
 		}
 
diff --git a/src/Eto.Wpf/Forms/Controls/WebView2Handler.cs b/src/Eto.Wpf/Forms/Controls/WebView2Handler.cs
index 6992dc29b2..32278101be 100755
--- a/src/Eto.Wpf/Forms/Controls/WebView2Handler.cs
+++ b/src/Eto.Wpf/Forms/Controls/WebView2Handler.cs
@@ -59,6 +59,10 @@ static class WebView2Loader
 		/// </summary>
 		public static WebView2InstallMode InstallMode = WebView2InstallMode.Manual;
 
+
+		const string reg64BitKey = @"HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\EdgeUpdate\Clients\{F3017226-FE2A-4295-8BDF-00C3A9A7E4C5}";
+		const string reg32BitKey = @"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\EdgeUpdate\Clients\{F3017226-FE2A-4295-8BDF-00C3A9A7E4C5}";
+
 		/// <summary>
 		/// Detects whether WebView2 is installed
 		/// </summary>
@@ -69,7 +73,7 @@ public static bool Detect()
 			return false;
 #endif
 			// https://docs.microsoft.com/en-us/microsoft-edge/webview2/concepts/distribution#deploying-the-evergreen-webview2-runtime
-			var pv = Registry.GetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\EdgeUpdate\Clients\{F3017226-FE2A-4295-8BDF-00C3A9A7E4C5}", "pv", null);
+			var pv = Registry.GetValue(Environment.Is64BitOperatingSystem ? reg64BitKey : reg32BitKey, "pv", null);
 			return pv is string s && !string.IsNullOrEmpty(s);
 		}
 
@@ -203,7 +207,7 @@ void Progress(double progress)
 				reportProgress?.Invoke(info);
 			}
 			// download bootstrapper to temp folder
-			var tempFile = Path.GetTempFileName();
+			var tempFile = Path.GetTempFileName() + ".exe";
 			try
 			{
 				info.Text = Loc("Downloading bootstrapper...");
@@ -229,6 +233,7 @@ void Progress(double progress)
 				// run with elevated privileges
 				var startInfo = new ProcessStartInfo(tempFile);
 				startInfo.Verb = "runas";
+				startInfo.UseShellExecute = false;
 				var result = await RunProcessAsync(startInfo);
 				if (result != 0 && !Detect())
 				{