Does SC9 support PHP 7.1 yet ?
Not sure, but as I haven’t found real issues running php 7 apps under 7.1 I think it’s pretty much upwards compatible. So I guess that you just upload to your 7.1 environment (ie. using wamp) and just try…
FYI. I have scriptcase installed on a remote server and it does not run on php 7.1. I had to roll back to php 7.0.