Artisan Error when attempting DF Upgrade from Version 2 -

I have a Bitnami native installed version 2.0 of DF on a Debian VM.

I am attempting to upgrade to the latest release of DF following the instructions at

When I reach step 6 of the upgrade which is Migrate the system data using the command
$ …/…/…/php/bin/php artisan migrate --seed I get the following error:
**Could not open input file: artisan

Any advice on this would be much appreciated - thank you