sef for SOBI2

Hi!
I've downloaded sobi2_sefa_ext.zip file.

in Readme I found text:

"Upload this file to directory ./components/com_sobi2/"

My sobi2 installation does not have own 'sef_ext.php' file, and when I put this file to /components/com_sobi2/ folder, nothing happens - sobi2 links are still not - sef.

I am using SOBI2 RC 2.9.2.3.

Is your plugin compatible with that SOBI2 version?

Did I miss something?

Thank you!

Make sure SEF is activated in global configurations and that SEF Advance is installed and enabled in its configuration.