If you look in that thread, the issue derives from the user directory name, which is based on the username. You said that you changed the username, but in each of the screenshots, the directory name still contains the extended character (C:\Users\Maintetat prêt). Changing that directory name could have unintended consequences as other software is dependent upon it, so be very careful doing so. The thread has suggestions from people who have addressed the issue: Unable to provision site due to special characters in Windows username - #52 by dev_dignamik
You could also try changing the Sites Path in the Local settings to a directory that doesn’t contain an extended character. Unable to provision site due to special characters in Windows username - #37 by ben.turner
I’m not a support agent here, just another Local user. I haven’t had this issue, so everything I’m saying is repeated from the thread that I linked to.