In many cases I now use SQLcl instead of the instant client. It's a small Java application from Oracle that gives you an SQL*Plus like experience, without needing a formal installation. Before considering the instant client, you should ask yourself if
Download the appropriate Instant Client packages for your platform. All installations require the Basic or Basic Light package. Add this directory to the PATH environment variable. If you have multiple versions of Oracle libraries installed, make sure the
Oracle Instant Client Downloads Instant Client for Microsoft Windows Instant Client for Microsoft Windows (x64) Instant Client for Microsoft Windows (32-bit)