Fix install

src/App.js

@@ -56,7 +56,10 @@ class App extends IPCContainer {
     }
   };
 
+  _isMounted = false;
+
   componentDidMount() {
+    this._isMounted = true;
     this.scheduledUpdateJob = Scheduler.scheduleJob('23 11 * * *', this.updateCheckScheduledJob);
     this.detectUpgrades();
   }
@@ -75,6 +78,7 @@ class App extends IPCContainer {
   }
 
   componentWillUnmount() {
+    this._isMounted = false;
     Scheduler.cancelJob(this.scheduledUpdateJob);
     super.componentWillUnmount();
   }
@@ -123,7 +127,7 @@ class App extends IPCContainer {
     if (result.Success) {
       const selectedVersion = this.getSelectedVersion();
       this.props.installRelease(result.Destination, selectedVersion, () => {
-        if (this.isMounted()) {
+        if (this._isMounted) {
           this.checkVersionInstalled();
         }
       });
@@ -140,7 +144,7 @@ class App extends IPCContainer {
   };
   
   onDownloadFileComplete = (name, type, url, result) => {
-    if (this.isMounted()) {
+    if (this._isMounted) {
       switch (type) {
         case Constants.INSTALL_TYPES.Dependency:
           this.installDependency(result);
@@ -159,7 +163,7 @@ class App extends IPCContainer {
   };
   
   onInstallDependencyComplete = (source, url, result) => {
-    if (this.isMounted()) {
+    if (this._isMounted) {
       if (result.Success && source.toLowerCase().endsWith('.dmg')) {
         this.waitForDependencyInstall(source, url);
       } else {
@@ -172,9 +176,9 @@ class App extends IPCContainer {
   };
   
   onInstallUpgradeComplete = (source, result) => {
-    if (this.isMounted() && !result.Success) {
+    if (this._isMounted && !result.Success) {
       this.props.notifyError(result.Error, false,() => {
-        if (this.isMounted()) {
+        if (this._isMounted) {
           // TODO Prompt to verify
           if (result.AllowSkipVerification) {
             this.installUpgrade({