Hello,
Note that we have an updated procedure for the LSTC license manager on Windows:
https://ftp.lstc.com/user/license/License-Manager/LS-DYNA%20Win%20License%20Server%20installation%20and%20update%20Aug%2026_2.pdf
username: user
password: computer
Thank you Loïc for providing the answer :).
Reno.