OK, I got through the PHP version problem by setting it to 5 on the hosting server, with an .htaccess file.
But now I get this error message at Stage 3 (Database setup).
Error while trying to connect to the database server:
SQLSTATE[HY000]  Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (13)
Sorry if this is a dumb question, or been asked before.