Sorry for your quick answer François.
here is the link to the .tar folder
https://filesender.renater.fr/?s=download&token=734a9ebe-ad04-4b52-bcb7-b40b041d262d
Yes I confirm that this is indeed the error message I get
** Error: Could not import FreeSurfer folder:
** MRI file was not found: T1.mgz
** Surface file was not found: lh.pial
** Surface file was not found: rh.pial
It doesn't make sense to me why the T1.mgz isn't seen although it is in the folder.?