Can you give us the full error message, please?

PHP Error log added. 3 lines of 3 differents attemps.

[27-Feb-2018 08:56:17 Europe/Berlin] PHP Fatal error:  Call to undefined method User::model() in C:\xampp\htdocs\lime\application\controllers\InstallerController.php on line 595

[27-Feb-2018 08:56:41 Europe/Berlin] PHP Fatal error:  Call to undefined method User::model() in C:\xampp\htdocs\lime\application\controllers\InstallerController.php on line 595

[27-Feb-2018 09:00:26 Europe/Berlin] PHP Fatal error:  Call to undefined method User::model() in C:\xampp\htdocs\lime\application\controllers\InstallerController.php on line 595

I can't reproduce this on my Linux machine, I will ping @c_schmitz for feedback on Windows.

I can successfully install on my Windows machine.

capture-3.png (69,793 bytes)   

capture-3.png (69,793 bytes)   

OK, then we need to enable debug information. Since it's during installation, it's a little bit harder. Go to index.php in the web root folder:

https://github.com/LimeSurvey/LimeSurvey/blob/master/index.php#L154-L173

All lines need to be removed except:

define('YII_DEBUG', true);
error_reporting(E_ALL);

Then please try again.

Done.
But i can't see any extra information about the problem.
I'm thinking to deploy LimeSurvey on Ubuntu instead of Windows...
Thanks for your quickly support.

Perhaps 3.4.3 no longer has this issue?