diff --git a/kmplot/kmplotio.cpp b/kmplot/kmplotio.cpp
--- a/kmplot/kmplotio.cpp
+++ b/kmplot/kmplotio.cpp
@@ -35,7 +35,8 @@
 #include <QTemporaryFile>
 
 // KDE includes
-#include <kio/netaccess.h>
+#include <KIO/StoredTransferJob>
+#include <KJobWidgets>
 #include <KMessageBox>
 #include <KLocalizedString>
 
@@ -142,11 +143,16 @@
 		doc.save( ts, 4 );
 		ts.flush();
 
-		if ( !KIO::NetAccess::upload(tmpfile.fileName(), url,0)) {
+		Q_CONSTEXPR int permission = -1;
+		QFile file(tmpfile.fileName());
+		file.open(QIODevice::ReadOnly);
+		KIO::StoredTransferJob *putjob = KIO::storedPut(file.readAll(), url, permission, KIO::JobFlag::Overwrite);
+		if (!putjob->exec()) {
 		    qWarning() << "Could not open " << url.toString() 
-			       << " for writing ("<<KIO::NetAccess::lastErrorString()<<").\n";
+			       << " for writing ("<<putjob->errorString()<<").\n";
 		    return false;
 		}
+		file.close();
 	}
 	else {
 	    QFile xmlfile (url.toLocalFile());
@@ -338,20 +344,27 @@
 {
 	QDomDocument doc( "kmpdoc" );
 	QFile f;
+	bool downloadedFile = false;
 	if ( !url.isLocalFile() )
 	{
-		if( !KIO::NetAccess::exists( url, KIO::NetAccess::SourceSide, 0 ) )
+		if( !MainDlg::fileExists( url ) )
 		{
 			KMessageBox::sorry(0,i18n("The file does not exist."));
 			return false;
 		}
-		QString tmpfile;
-		if( !KIO::NetAccess::download( url, tmpfile, 0 ) )
-		{
-			KMessageBox::sorry(0,i18n("An error appeared when opening this file (%1)", KIO::NetAccess::lastErrorString() ));
-			return false;
+		downloadedFile = true;
+		KIO::StoredTransferJob *transferjob = KIO::storedGet (url);
+		KJobWidgets::setWindow(transferjob, 0);
+		if ( !transferjob->exec() ) {
+		    KMessageBox::sorry(0,i18n("An error appeared when opening this file (%1)", transferjob->errorString() ));
+		    return false;
 		}
-		f.setFileName(tmpfile);
+		QTemporaryFile file;
+		file.setAutoRemove(false);
+		file.open();
+		file.write(transferjob->data());
+		f.setFileName(file.fileName());
+		file.close();
 	}
 	else
 		f.setFileName( url.toLocalFile() );
@@ -374,8 +387,8 @@
 	if ( !restore( doc ) )
 		return false;
 
-	if ( !url.isLocalFile() )
-		KIO::NetAccess::removeTempFile( f.fileName() );
+	if ( downloadedFile )
+		QFile::remove( f.fileName() );
 	return true;
 }
 
diff --git a/kmplot/kparametereditor.cpp b/kmplot/kparametereditor.cpp
--- a/kmplot/kparametereditor.cpp
+++ b/kmplot/kparametereditor.cpp
@@ -26,23 +26,24 @@
 #include "kparametereditor.h"
 
 #include <QDebug>
-#include <kinputdialog.h>
-#include <kio/netaccess.h>
-#include <KMessageBox>
-#include <KPushButton>
-#include <QTemporaryFile>
-#include <kurl.h>
+#include <QDialogButtonBox>
 #include <QFile>
-#include <QTextStream>
+#include <QFileDialog>
 #include <QList>
 #include <QListWidget>
-
-#include <assert.h>
-#include <KConfigGroup>
-#include <QDialogButtonBox>
 #include <QPushButton>
+#include <QTemporaryFile>
+#include <QTextStream>
 #include <QVBoxLayout>
-#include <QFileDialog>
+#include <KConfigGroup>
+#include <KIO/StoredTransferJob>
+#include <KInputDialog>
+#include <KJobWidgets>
+#include <KMessageBox>
+
+#include "maindlg.h"
+
+#include <assert.h>
 
 class ParameterValueList;
 
@@ -225,27 +226,32 @@
 	if ( url.isEmpty() )
 		return;
 
-        if (!KIO::NetAccess::exists(url, KIO::NetAccess::SourceSide, this) )
+        if (!MainDlg::fileExists( url ) )
         {
 			KMessageBox::sorry(0,i18n("The file does not exist."));
-                return;
+			return;
         }
 
 	bool verbose = false;
-        QFile file;
-        QString tmpfile;
-        if ( !url.isLocalFile() )
-        {
-                if ( !KIO::NetAccess::download(url, tmpfile, this) )
-                {
-					KMessageBox::sorry(0,i18n("An error appeared when opening this file"));
-                        return;
-                }
-                file.setFileName(tmpfile);
-        }
-        else
-                file.setFileName(url.toLocalFile() );
-	
+	QFile file;
+	if ( !url.isLocalFile() )
+	{
+		KIO::StoredTransferJob *transferjob = KIO::storedGet (url);
+		KJobWidgets::setWindow(transferjob, 0);
+		if ( !transferjob->exec() ) {
+			KMessageBox::sorry(0,i18n("An error appeared when opening this file: %1", transferjob->errorString() ));
+			return;
+		}
+		QTemporaryFile tmpfile;
+		tmpfile.setAutoRemove(false);
+		tmpfile.open();
+		tmpfile.write(transferjob->data());
+		file.setFileName(tmpfile.fileName());
+		tmpfile.close();
+	}
+	else
+		file.setFileName(url.toLocalFile() );
+
 	if ( file.open(QIODevice::ReadOnly) )
 	{
 		QTextStream stream(&file);
@@ -270,7 +276,7 @@
 				if ( KMessageBox::warningContinueCancel(this,i18n("Line %1 is not a valid parameter value and will therefore not be included. Do you want to continue?", i) ) == KMessageBox::Cancel)
 				{
 					file.close();
-                                        KIO::NetAccess::removeTempFile( tmpfile );
+					QFile::remove( file.fileName() );
 					return;
 				}
 				else if (KMessageBox::warningYesNo(this,i18n("Would you like to be informed about other lines that cannot be read?"), QString(), KGuiItem(i18n("Get Informed")), KGuiItem(i18n("Ignore Information")) ) == KMessageBox::No)
@@ -283,23 +289,23 @@
 		KMessageBox::sorry(0,i18n("An error appeared when opening this file"));
         
         if ( !url.isLocalFile() )
-                KIO::NetAccess::removeTempFile( tmpfile );
+                QFile::remove( file.fileName() );
 }
 
 
 void KParameterEditor::cmdExport_clicked()
 {
 	if ( !m_mainWidget->list->count() )
                 return;
 	QUrl url = QFileDialog::getSaveFileUrl(this, i18n("Save File"), QUrl(), i18n("Plain Text File (*.txt)"));
-        if ( url.isEmpty() )
-                return;
+	if ( url.isEmpty() )
+		return;
 
-        if( !KIO::NetAccess::exists( url, KIO::NetAccess::DestinationSide, this ) || KMessageBox::warningContinueCancel( this, i18n( "A file named \"%1\" already exists. Are you sure you want to continue and overwrite this file?", url.toDisplayString()), i18n( "Overwrite File?" ), KStandardGuiItem::overwrite() ) == KMessageBox::Continue )
-        {
-                if ( !url.isLocalFile() )
-                {
-                        QTemporaryFile tmpfile;
+	if( !MainDlg::fileExists( url ) || KMessageBox::warningContinueCancel( this, i18n( "A file named \"%1\" already exists. Are you sure you want to continue and overwrite this file?", url.toDisplayString()), i18n( "Overwrite File?" ), KStandardGuiItem::overwrite() ) == KMessageBox::Continue )
+	{
+		if ( !url.isLocalFile() )
+		{
+			QTemporaryFile tmpfile;
 
 			if (tmpfile.open() )
 			{
@@ -315,16 +321,20 @@
 			}
 			else
 				KMessageBox::sorry(0,i18n("An error appeared when saving this file"));
-                        
-                        if ( !KIO::NetAccess::upload(tmpfile.fileName(),url, this) )
-                        {
+
+			Q_CONSTEXPR int permission = -1;
+			QFile file(tmpfile.fileName());
+			file.open(QIODevice::ReadOnly);
+			KIO::StoredTransferJob *putjob = KIO::storedPut(file.readAll(), url, permission, KIO::JobFlag::Overwrite);
+			if (!putjob->exec()) {
 				KMessageBox::sorry(0,i18n("An error appeared when saving this file"));
-                                return;
-                        }
-                }
-                else
-                {
-	                QFile file;
+				return;
+			}
+			file.close();
+		}
+		else
+		{
+			QFile file;
 			qDebug() << "url.path()="<<url.toLocalFile();
 			file.setFileName(url.toLocalFile());
 			if (file.open( QIODevice::WriteOnly ) )
@@ -338,7 +348,7 @@
 						stream << endl; //only write a new line if there are more text
 				}
 				file.close();
-                        }
+			}
                         else
 				KMessageBox::sorry(0,i18n("An error appeared when saving this file"));
                 }
diff --git a/kmplot/maindlg.h b/kmplot/maindlg.h
--- a/kmplot/maindlg.h
+++ b/kmplot/maindlg.h
@@ -96,14 +96,17 @@
 	/// Returns true if any changes are done
 	bool isModified(){return m_modified;}
 
-    bool queryClose() Q_DECL_OVERRIDE;
+	bool queryClose() Q_DECL_OVERRIDE;
 
 	/// For inserting the title in the function popup menu
 	QAction * m_firstFunctionAction;
 
 	/// Show the constants editor modal to a parent dialog
 	void editConstantsModal(QWidget *parent);
 
+	/// Check whether the url links to an existing file
+	static bool fileExists(const QUrl &url);
+
 
 public Q_SLOTS:
     // DBus interface
diff --git a/kmplot/maindlg.cpp b/kmplot/maindlg.cpp
--- a/kmplot/maindlg.cpp
+++ b/kmplot/maindlg.cpp
@@ -46,8 +46,7 @@
 #include <kconfigdialog.h>
 #include <kconfigdialogmanager.h>
 #include <kedittoolbar.h>
-#include <kimageio.h>
-#include <kio/netaccess.h>
+#include <KIO/StatJob>
 #include <kcomponentdata.h>
 #include <klineedit.h>
 #include <kmessagebox.h>
@@ -523,8 +522,7 @@
 	if ( url.isEmpty() )
 		return;
 
-	bool exists = KIO::NetAccess::exists( url, KIO::NetAccess::DestinationSide, m_parent );
-	if ( exists )
+	if ( MainDlg::fileExists( url ) )
 	{
 		// check if file exists and overwriting is ok.
 
@@ -574,8 +572,7 @@
 
 	if ( !url.isValid() )
 		return;
-	bool exists = KIO::NetAccess::exists( url, KIO::NetAccess::DestinationSide, m_parent );
-	if ( exists )
+	if ( MainDlg::fileExists( url ) )
 	{
 		// check if file exists and overwriting is ok.
 
@@ -585,18 +582,11 @@
 			return;
 	}
 
-QMimeDatabase db;
-	QMimeType mimeType = db.mimeTypeForUrl( url );
+	QMimeType mimeType = mimeDatabase.mimeTypeForUrl( url );
 	qDebug() << "mimetype: " << mimeType.name();
 
 	bool isSvg = mimeType.name() == "image/svg+xml";
 
-	if ( !KImageIO::isSupported( mimeType.name(), KImageIO::Writing ) && !isSvg )
-	{
-		KMessageBox::sorry( m_parent, i18n( "Sorry, this file format is not supported." ) );
-		return;
-	};
-
 	bool saveOk = true;
 
 	if ( isSvg )
@@ -621,14 +611,21 @@
 		View::self()->draw( &img, View::SVG );
 
 		if ( !url.isLocalFile() )
-			saveOk &= KIO::NetAccess::upload(tmp.fileName(), url, 0);
+		{
+		    Q_CONSTEXPR int permission = -1;
+		    QFile file(tmp.fileName());
+		    file.open(QIODevice::ReadOnly);
+		    KIO::StoredTransferJob *putjob = KIO::storedPut(file.readAll(), url, permission, KIO::JobFlag::Overwrite);
+		    saveOk &= putjob->exec();
+		    file.close();
+		}
 	}
 	else
 	{
 		QPixmap img( View::self()->size() );
 		View::self()->draw( & img, View::Pixmap );
 
-		QStringList types = KImageIO::typeForMime( mimeType.name() );
+		QStringList types = mimeType.suffixes();
 		if ( types.isEmpty() )
 			return; // TODO error dialog?
 
@@ -639,7 +636,12 @@
 			QTemporaryFile tmp;
 			tmp.open();
 			img.save( tmp.fileName(), types.at(0).toLatin1() );
-			saveOk = KIO::NetAccess::upload(tmp.fileName(), url, 0);
+			Q_CONSTEXPR int permission = -1;
+			QFile file(tmp.fileName());
+			file.open(QIODevice::ReadOnly);
+			KIO::StoredTransferJob *putjob = KIO::storedPut(file.readAll(), url, permission, KIO::JobFlag::Overwrite);
+			saveOk = putjob->exec();
+			file.close();
 		}
 	}
 
@@ -742,6 +744,21 @@
 	m_constantEditor->show();
 }
 
+bool MainDlg::fileExists(const QUrl &url)
+{
+	bool fileExists = false;
+	if (url.isValid()) {
+		short int detailLevel = 0; // Lowest level: file/dir/symlink/none
+		KIO::StatJob* statjob = KIO::stat(url, KIO::StatJob::SourceSide, detailLevel);
+		bool noerror = statjob->exec();
+		if (noerror) {
+			// We want a file
+			fileExists = !statjob->statResult().isDir();
+		}
+	}
+	return fileExists;
+}
+
 void MainDlg::slotNames()
 {
 	KHelpClient::invokeHelp( "func-predefined", "kmplot" );