SQL Server 2012 Developer Edition - Installation failed

Question

I'm trying to install SQL Server 2012 Developer Edition (French) but when I'm loading the .iso and running the setup, an instant error window appears saying :

This SQL Server setup media does not support the language of the OS, or does not have the SQL Server English-language version installation files. Use the matching language-specific SQL Server media; or install both the language specific MUI and change the format and system locales through the regional settings in the control panel

My OS language is set on FR (French) and the SQL Server that I got is also a french version... Any idea about what's going on?

Solution

SQL Server requires some additional software before core installation. Check log in root folder while error window is active.
Hardware and Software Requirements for Installing SQL Server 2012

Local Language Versions in SQL Server:

Localized versions of SQL Server are supported on localized operating systems with the corresponding language or on English-language versions of supported operating systems by using the Windows Multilingual User Interface Pack (MUI) settings. For more information, see Configure Operating System to Support Localized Versions.

Localized versions of SQL Server are supported on English-language versions of supported operating systems through the use of Windows Multilingual User Interface Pack (MUI) settings.

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However, you must verify certain operating system settings before installing a localized version of SQL Server on a server that is running an English-language operating system with a non-English MUI setting. You need to verify that the following operating system settings match the language of the localized SQL Server to be installed:

• The operating system user interface setting
• The operating system user locale setting
• The system locale setting