@musicmaster - it's my pleasure to contradict you. I have run the script and for now at least front office it seems to be working.
I cannot log in in backoffice.
LE :
reading the manual (RTFM 
) :
- copy the security strings (Ryndael keys, Cookie keys, etc) from the settings.inc.php of the old shop to the settings.inc.php of the new shop. Without this you won't be able to login. [Note: in Prestashop 1.7 the keys are in parameters.php but at least for the employee password this is not needed]
LE 2 :
copied \public_html\test16\config\settings.inc.php
to
\public_html\app\config\parameters.php
cookie values and I have been able to log in backoffice