Disable version mismatch check.

--- a/gui/preferences.ui
+++ b/gui/preferences.ui
@@ -53,13 +53,6 @@
           </property>
          </widget>
         </item>
-        <item>
-         <widget class="QCheckBox" name="ignoreVersionMismatchCheck">
-          <property name="text">
-           <string>Ignore mismatch between command line and GUI version.</string>
-          </property>
-         </widget>
-        </item>
        </layout>
       </widget>
      </widget>
--- a/gui/preferences.cc
+++ b/gui/preferences.cc
@@ -42,7 +42,6 @@ Preferences::Preferences(QWidget* parent, QList<Format>& formatList,
 
   ui_.startupCheck->setChecked(babelData_.startupVersionCheck_);
   ui_.reportStatisticsCheck->setChecked(babelData_.reportStatistics_);
-  ui_.ignoreVersionMismatchCheck->setChecked(babelData_.ignoreVersionMismatch_);
 
   connect(ui_.buttonBox, &QDialogButtonBox::accepted, this, &Preferences::acceptClicked);
   connect(ui_.buttonBox, &QDialogButtonBox::rejected, this, &Preferences::rejectClicked);
@@ -82,7 +81,6 @@ void Preferences::acceptClicked()
 
   babelData_.startupVersionCheck_ = ui_.startupCheck->isChecked();
   babelData_.reportStatistics_ = ui_.reportStatisticsCheck->isChecked();
-  babelData_.ignoreVersionMismatch_ = ui_.ignoreVersionMismatchCheck->isChecked();
   accept();
 }
 
--- a/gui/babeldata.h
+++ b/gui/babeldata.h
@@ -66,7 +66,7 @@ public:
     startupVersionCheck_(true),
     reportStatistics_(true),
     allowBetaUpgrades_(false),
-    ignoreVersionMismatch_(false),
+    ignoreVersionMismatch_(true),
     disableDonateDialog_(false),
     donateSplashed_(QDateTime(QDate(2010, 1, 1), QTime(0, 0, 0)))
   {
