Verified WiX 3.14 would build an arm64 installer for us

ILSpy.Installer/setup.cs

@@ -38,6 +38,8 @@ namespace ILSpy.Installer
 
 #if ARM64
 			project.Platform = Platform.arm64;
+			// https://github.com/oleg-shilo/wixsharp/issues/1296#issuecomment-1575523854 3.11.2 won't do, need 3.14
+			// Compiler.WixLocation = @"D:\GitWorkspace\_wix314-binaries";
 #else
 			project.Platform = Platform.x64;
 #endif