I'm assuming the 'unable to open *.sql' errors are because oracle is looking for them in a different directory. Those files are present in the same directory as oe_main.sql whose location I specify at the start. Should'nt this be enough?No. The main-script calls the subscripts relative to the directory you started your sqlplus from. You should change to */demo/schema/oe*, start +@oe_main.sql+ there and the installation should finish without further issues.