diff --git a/app/src/cc/arduino/packages/contributions/ui/ContributedPlatformTableCell.java b/app/src/cc/arduino/packages/contributions/ui/ContributedPlatformTableCell.java
index cc337b7dc..0437c78e0 100644
--- a/app/src/cc/arduino/packages/contributions/ui/ContributedPlatformTableCell.java
+++ b/app/src/cc/arduino/packages/contributions/ui/ContributedPlatformTableCell.java
@@ -28,36 +28,27 @@
  */
 package cc.arduino.packages.contributions.ui;
 
-import static processing.app.I18n._;
-import static processing.app.I18n.format;
+import cc.arduino.packages.contributions.ContributedBoard;
+import cc.arduino.packages.contributions.ContributedPlatform;
+import cc.arduino.packages.contributions.ui.ContributionIndexTableModel.ContributedPlatformReleases;
+import cc.arduino.ui.InstallerTableCell;
+import processing.app.Base;
 
-import java.awt.Color;
-import java.awt.Component;
-import java.awt.Insets;
-import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
-
-import javax.swing.Box;
-import javax.swing.BoxLayout;
-import javax.swing.JButton;
-import javax.swing.JComboBox;
-import javax.swing.JLabel;
-import javax.swing.JPanel;
-import javax.swing.JTable;
-import javax.swing.JTextPane;
-import javax.swing.Timer;
+import javax.swing.*;
 import javax.swing.border.EmptyBorder;
 import javax.swing.event.HyperlinkEvent;
 import javax.swing.event.HyperlinkListener;
 import javax.swing.text.Document;
 import javax.swing.text.html.HTMLDocument;
 import javax.swing.text.html.StyleSheet;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.ItemEvent;
+import java.awt.event.ItemListener;
 
-import processing.app.Base;
-import cc.arduino.packages.contributions.ContributedBoard;
-import cc.arduino.packages.contributions.ContributedPlatform;
-import cc.arduino.packages.contributions.ui.ContributionIndexTableModel.ContributedPlatformReleases;
-import cc.arduino.ui.InstallerTableCell;
+import static processing.app.I18n._;
+import static processing.app.I18n.format;
 
 @SuppressWarnings("serial")
 public class ContributedPlatformTableCell extends InstallerTableCell {
@@ -103,7 +94,7 @@ public class ContributedPlatformTableCell extends InstallerTableCell {
       }
     });
 
-    installButton = new JButton(_("Update"));
+    installButton = new JButton(_("Install"));
     installButton.addActionListener(new ActionListener() {
       @Override
       public void actionPerformed(ActionEvent e) {
@@ -132,6 +123,14 @@ public class ContributedPlatformTableCell extends InstallerTableCell {
     downgradeChooser = new JComboBox();
     downgradeChooser.addItem("-");
     downgradeChooser.setMaximumSize(downgradeChooser.getPreferredSize());
+    downgradeChooser.addItemListener(new ItemListener() {
+      @Override
+      public void itemStateChanged(ItemEvent e) {
+        Object selectVersionItem = downgradeChooser.getItemAt(0);
+        boolean disableDowngrade = (e.getItem() == selectVersionItem);
+        downgradeButton.setEnabled(!disableDowngrade);
+      }
+    });
 
     panel = new JPanel();
     panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
@@ -219,6 +218,7 @@ public class ContributedPlatformTableCell extends InstallerTableCell {
     setEnabled(true);
 
     downgradeChooser.removeAllItems();
+    downgradeChooser.addItem(_("Select version"));
     boolean visible = false;
     for (ContributedPlatform release : editorValue.releases) {
       if (release.isInstalled())
@@ -240,16 +240,23 @@ public class ContributedPlatformTableCell extends InstallerTableCell {
     ContributedPlatform selectedPlatform = releases.getSelected();
     ContributedPlatform installedPlatform = releases.getInstalled();
 
-    boolean removable, upgradable;
+    boolean removable, installable, upgradable;
     if (installedPlatform == null) {
+      installable = true;
       removable = false;
       upgradable = false;
     } else {
+      installable = false;
       removable = true;
       upgradable = (selectedPlatform != installedPlatform);
     }
 
-    installButton.setVisible(upgradable);
+    if (installable)
+      installButton.setText(_("Install"));
+    if (upgradable)
+      installButton.setText(_("Upgrade"));
+    installButton.setVisible(installable || upgradable);
+
     removeButton.setVisible(removable);
     removeButtonStrut.setVisible(removable);