Instant Client, a free download from Oracle, allows you to run your applications without installing the standard Oracle client or having an ORACLE_HOME.
To use Oracle's Instant Client with Acu4GL for Oracle, download the "Basic Lite" and "SQL*Plus" packages from Oracle. Follow Oracle's instructions to install and configure the products and test their connection using SQL*Plus before proceeding to work with Acu4GL.
Once you have completed this process, test the installation.