@dave r said:

After starting shape Bender, does the cursor change to an arrow with a straight line below it?

And is the line outside the group or part of it?

It´s fixed, i am too impacient! The problem was about putting the shape bender folder in the wrong place. I used the whole unzipped folder under the plugins directory...
Thank you Dave (and Chris of course. let´s have some fun

i can´t make it work...
it loaded correctly after install but i can´t select the line on the red axis. i guess this is not a new thing but i still can´t find a solution around.
group selected > shape bender > it doesn´t recognized the line...