@koahnig Hi, thank you for your answer!
I think it works now.
To be honest I don't really know why it didn't work. I tried a lot, also turning off firewall and load online and offline installer from different pages for case, that the .exe is corrupted.
Last thing I did is to check the regedit and delete all Qt*-data in HKEY_(...)\SOFTWARE. Its working now. The problem was probably because of unclean deinstallation of previous version.

@jsulm we make an installation file for our combined system, including multiple programs sharing some but not other resources. we use an nsi script to manage this. usually works fine. I just missed updating some of the .dll files.

@SGaist It worked. Thank you so much.

@JosephTLyons If you used the installed for Qt 4.2 then it probably exists in a single directory. So just like anything else on OSX you can just delete that directory and should be all uninstalled. If there is a dir outside the /Applications directory you may need to clean that up too. Sorry not 100% sure here since all my OSX Qt installs were built from source so I don't know how the installer works on OSX. On Linux it's a single directory.

Anyway, once /Applications/Qt* is deleted you should be ready to do the install from Qt 5.11. Qt4 and 5 rarely play nice together in my opinion so a nice clean install would be a good idea. You can make them work on the same system but in my experience on these forums people mix their dylibs all the time and get weird behavior, crashes, failures to load, etc. So if you want them both for some reason just make sure they stay separate.

http://download.qt.io/official_releases/qt/

You also have the MaintenanceTool that offers that possibility.

Is there a difference between Quick Controls and Quick Controls 2

Yes, QQ 1 was the first iteration, QQ 2 is the new one. They are not the same, QQ 2 was redesigned and implemented from scratch due to certain problems in QQ 1.

are both included in the initial installation

Yes.

@ajcurtis said in QtCreator can not load plugins UBuntu 16.04:

QApplication: invalid style override passed, ignoring it.

But it is running now? If so then just ignore that warning.

@rggarcia said in Qt 5.8 installation - MacOS Sierra:

qtpcre_debug

Looks like qtpcre_debug was not built. Did you have any errors while compiling? Do you have to build Qt by yourself?

Following that wiki entry, recent versions of the Android NDK are problematic. It is recommended to use ndk-r10e.

I found qtlicense, i deleted this file. But nothing happens.

Then i create a new account on Qt installer, and re-install the open source version.
That did the trick. Many thanks Dheerendra.

Regards, Nahuel.

Did you install MSVC2015 before or after Qt ?

Can you see it in the Compilers tab ?

Thanks, contacted @alex_malyu directly.

offline and MinGW

That is what I was thinking regarding the compatibility of the two versions, I will attempt the change and let you know

@Ratzz spam, it's been removed.

I found the answer. The problem is that the QtWebKit.framework bundle requires some of these other ones, even though I might not be using them. The only fix would be to acquire the QtWebKit.framework project, remove the QML and Quick dependencies, recompile, swap that framework bundle out of my project after macdeployqt, and then remove the QML and Quick framework bundles.

Long story short, that ain't happening. Not worth my time because it's super difficult.

I stumbled upon this answer and added those links found in this this xml file:

http://download.qt-project.org/online/qtsdkrepository/linux_x64/desktop/tools_maintenance http://download.qt-project.org/online/qtsdkrepository/linux_x64/root/qt

Now I have repositories configured and everything is fine.

Hi and welcome to devnet,

You can use QtSdkRepoChooser to try another mirror.

Hope it helps