No possible click on at the left side of the trackpad.
With the exact repair procedure with photos from Ifixt, the replacement of trackpad was possible without any problems.
I bought a PRO TECH TOOLKIT, unfortunately the Pentalobe screwdriver used for the repair of the Macbook Air aren't Pro. The finish of the Pentalobe screwdriver isn't precise enough and the material used is too soft. That means for me, after the repair the Pentalobe screwdriver is useless. All the Pentalobe screws used to fix the bottom case are all fixed with blue screw glue. For the futur is would be useful to use better Pentalobe screwdriver, and even replace the Pentalobe screws from the bottom case with new screws since the screws are partially damaged due the bad quality of the Pentalobe screwdriver after the repair.