diff -r bc7b6aa5d67a -r 7030706266df QTfrontend/util/platform/M3InstallController.m
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/QTfrontend/util/platform/M3InstallController.m	Fri Dec 06 22:20:53 2019 +0100
@@ -0,0 +1,140 @@
+/*****************************************************************
+ M3InstallController.m
+
+ Created by Martin Pilkington on 02/06/2007.
+
+ Copyright (c) 2006-2009 M Cubed Software
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation
+ files (the "Software"), to deal in the Software without
+ restriction, including without limitation the rights to use,
+ copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following
+ conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ OTHER DEALINGS IN THE SOFTWARE.
+
+ *****************************************************************/
+
+#import "M3InstallController.h"
+#import "NSWorkspace_RBAdditions.h"
+
+#import <Foundation/Foundation.h>
+
+@implementation M3InstallController
+
+-(id) init {
+    if ((self = [super init])) {
+        NSString *appName = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleName"];
+        NSString *title = [NSString stringWithFormat:NSLocalizedString(@"%@ is currently running from a disk image", @"AppName is currently running from a disk image"), appName];
+        NSString *body = [NSString stringWithFormat:NSLocalizedString(@"Would you like to install %@ in your applications folder before quitting?", @"Would you like to install App Name in your applications folder before quitting?"), appName];
+        alert = [[NSAlert alertWithMessageText:title
+                                 defaultButton:NSLocalizedString(@"Install", @"Install")
+                               alternateButton:NSLocalizedString(@"Don't Install", @"Don't Install")
+                                   otherButton:nil
+                     informativeTextWithFormat:body] retain];
+        //[alert setShowsSuppressionButton:YES];
+    }
+    return self;
+}
+
+-(void) displayInstaller {
+    NSString *imageFilePath = [[[NSWorkspace sharedWorkspace] propertiesForPath:[[NSBundle mainBundle] bundlePath]] objectForKey:NSWorkspace_RBimagefilepath];
+    if (imageFilePath && ![imageFilePath isEqualToString:[NSString stringWithFormat:@"/Users/.%@/%@.sparseimage", NSUserName(), NSUserName()]] && ![[NSUserDefaults standardUserDefaults] boolForKey:@"M3DontAskInstallAgain"]) {
+        NSInteger returnValue = [alert runModal];
+        if (returnValue == NSAlertDefaultReturn) {
+            [self installApp];
+        }
+        if ([NSAlert instancesRespondToSelector:@selector(suppressionButton)])
+            if ([[alert performSelector:@selector(suppressionButton)] state] == NSOnState)
+                [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"M3DontAskInstallAgain"];
+        }
+}
+
+-(void) installApp {
+    NSString *appsPath = [[NSString stringWithString:@"/Applications"] stringByAppendingPathComponent:[[[NSBundle mainBundle] bundlePath] lastPathComponent]];
+    NSString *userAppsPath = [[[NSString stringWithString:@"~/Applications"] stringByAppendingPathComponent:[[[NSBundle mainBundle] bundlePath] lastPathComponent]] stringByExpandingTildeInPath];
+    NSString *appName = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleName"];
+    NSString *currentPath = [[NSBundle mainBundle] bundlePath];
+    NSString *finalPath;
+    NSError *error = nil;
+    BOOL success;
+
+    // Prepare the remove invocation
+    SEL removeSelector;
+    if ([NSFileManager instancesRespondToSelector:@selector(removeItemAtPath:error:)])
+        removeSelector = @selector(removeItemAtPath:error:);
+    else
+        removeSelector = @selector(removeFileAtPath:handler:);
+
+    NSMethodSignature *removeSignature = [NSFileManager instanceMethodSignatureForSelector:removeSelector];
+    NSInvocation *removeInvocation = [NSInvocation invocationWithMethodSignature:removeSignature];
+    [removeInvocation setTarget:[NSFileManager defaultManager]];
+    [removeInvocation setSelector:removeSelector];
+
+    // Delete the app if already installed
+    if ([[NSFileManager defaultManager] fileExistsAtPath:appsPath]) {
+        [removeInvocation setArgument:&appsPath atIndex:2];
+        [removeInvocation setArgument:&error atIndex:3];
+        [removeInvocation invoke];
+    }
+
+    // Prepare the copy invocation
+    SEL copySelector;
+    if ([NSFileManager instancesRespondToSelector:@selector(copyItemAtPath:toPath:error:)])
+        copySelector = @selector(copyItemAtPath:toPath:error:);
+    else
+        copySelector = @selector(copyPath:toPath:handler:);
+
+    NSMethodSignature *copySignature = [NSFileManager instanceMethodSignatureForSelector:copySelector];
+    NSInvocation *copyInvocation = [NSInvocation invocationWithMethodSignature:copySignature];
+
+    [copyInvocation setTarget:[NSFileManager defaultManager]];
+    [copyInvocation setSelector:copySelector];
+
+    // Copy the app in /Applications
+    [copyInvocation setArgument:&currentPath atIndex:2];
+    [copyInvocation setArgument:&appsPath atIndex:3];
+    [copyInvocation setArgument:&error atIndex:4];
+    [copyInvocation invoke];
+    [copyInvocation getReturnValue:&success];
+    finalPath = @"/Applications";
+
+    // In case something went wrong, let's try again somewhere else
+    if (success == NO) {
+        // Delete the app if already installed
+        if ([[NSFileManager defaultManager] fileExistsAtPath:userAppsPath]) {
+            [removeInvocation setArgument:&userAppsPath atIndex:2];
+            [removeInvocation invoke];
+        }
+
+        // Copy the app in ~/Applications
+        [copyInvocation setArgument:&userAppsPath atIndex:3];
+        [copyInvocation invoke];
+        [copyInvocation getReturnValue:&success];
+        finalPath = [[NSString stringWithString:@"~/Applications"] stringByExpandingTildeInPath];
+    }
+
+    if (success)
+        NSRunAlertPanel([NSString stringWithFormat:NSLocalizedString(@"%@ installed successfully", @"successful installation title"), appName],
+              [NSString stringWithFormat:NSLocalizedString(@"%@ was installed in %@", @"successfull installation text"), appName, finalPath],
+              NSLocalizedString(@"Ok", @"ok message"), nil, nil);
+    else
+        NSRunAlertPanel([NSString stringWithFormat:NSLocalizedString(@"Could not install %@", @"installation failure title"), appName],
+              NSLocalizedString(@"An error occurred when installing", @"installation failure text"),
+              NSLocalizedString(@"Quit", @"exit message"), nil, nil);
+}
+
+@end