I installed the 32-bit ODAC (188.8.131.52.1) from here. The Oracle Universal Installer version contains Oracle SQL*Plus 184.108.40.206.0. But I'm missing the sqlplus/admin/ folder in the installation, where I usually put the glogin.sql file.
This install is on a new Windows 7 - 64 bit Notebook, which is my first 64-bit Windows system.
The initial idea is not to install any Oracle server there, but I guess I'll change my mind about this during the first 2 month.
I find sqlplus.exe in the folder D:\app\berndk\product\11.2.0\client_1.
BTW This install has no sqlplus subfolder and the ORACLE_HOME environment varaiable is not set. As I do not need ODBC that install generally works quite well.