Hide duplicate entries to same Python binary

Tools/WinML-Dashbaord/src/python/python.tsx

@@ -28,7 +28,7 @@ export function getPythonBinaries() {
     if (process.platform === 'win32' && binaries[0] !== localPython) {
         binaries.push(null);  // use null to represent local, embedded version
     }
-    return binaries;
+    return [...new Set(binaries)];
 }
 
 function unzip(buffer: Buffer, directory: string, success: () => void, errorCallback: (err: Error) => void) {

Tools/WinML-Dashbaord/src/view/convert/View.tsx

@@ -49,7 +49,7 @@ export default class ConvertView extends React.Component<{}, IComponentState> {
             case InstallationStep.Downloading:
                 return <Spinner label="Downloading Python..." />;
             case InstallationStep.Installing:
-                return <Spinner label="Installing converter..." />;
+                return <Spinner label="Downloading and installing converter..." />;
         }
         this.venvPython = this.venvPython || getVenvPython();
         if (!this.venvPython) {

Tools/WinML-Dashbaord/tsconfig.json

@@ -4,6 +4,7 @@
     "outDir": "build/dist",
     "module": "esnext",
     "target": "es5",
+    "downlevelIteration": true,
     "lib": ["es6", "es2016", "es2017.object", "dom"],
     "sourceMap": true,
     "allowJs": true,