Thanks @eguiraud, but we already asked to try all that, without success apparently…
I figured out my mistake: Turns out my workspace was wrong;
C:\Users\bellenot>build\release\bin\thisroot.bat
C:\Users\bellenot> root
And write there:
What I tried then was:
C:\Users\bellenot>build\release\bin\thisroot.bat
C:\Users\bellenot>cd %ROOTSYS%\tutorials
C:\Users\bellenot\build\release\tutorials>root
And then I was able to execute the codes without issue.