Hi, it seems that is solved, but I tell you the short story.
I made all process as you said. While the SODE program was installing it said that could not find the fs file and fsx.cfg file and therefore it couldn't register.
I finish the installation, and once in the simulator no option of gsx or add-on manager in the simulator menu.
So, I went to user/myname/app data/roaming/microsoft and I founded two files , one FS and other FS SE.
I renamed both, FS to Off and FS WE to FS. As well Fs_se.cfg to fs cfg.
When I load the simulator again , everything was fine again.
What I don't know is whether solution came from exclude in the antivirus or from renaming the file.
In any case, something curious, after all of that if I rename again the "new" FS file to FS-SE again and load the simulator it start from the scratch, and again it doesn't recognize gsx.
Thanks for your help and by the way I don't know why but flashing lights of gsx vehicles has come again to life.