I have OpenGL 3.1 but kivy says that I have only 1.1

From the startup log text you posted in that other link:

Having you tried updating your graphics drivers to the latest available for your GPU as suggested?

The above errors indicate that you’re falling back to Microsoft’s super-old “GDI Generic” OpenGL driver (which only offers OpenGL 1.1 support, and via the CPU not the GPU). This often occurs because Windows doesn’t think there are any graphics drivers installed that can do any better than this.

Typically, you can fix this by updating your graphics drivers to the latest available for your GPU.

To update your graphics drivers, see the driver download links here:

Failing that, you might try the standard kivy solution for this error listed here: