I think there's a hard coded directory name in the install.vbs files so the verifyConnection.sql file is not found and the install.hta script fails with error:
SP2-0310: unable to open file "e:/GITHUB/xml-sample-demo/XFILES/install/sql/verifyConnection.sql"
e.g. XFILES/install/install.vbs, line 2568
executeSQLPLUS(user, password, role, "**e:/GITHUB/xml-sample-demo/XFILES/install/**sql/verifyConnection.sql")
Maybe it should be:
executeSQLPLUS(user, password, role, "sql/verifyConnection.sql")
Which seems to work for me.