For ODBC Driver for Teradata, starting with 15.10.10.00 (UNIX bundle, Windows, and OS X Suites), multiple releases can co-exist on the same system (i.e, 15.10.10.00 and 16.00.00.00 can co-exist together on the system at the same time).
If a specific version of the driver that is not the active TTU version is needed by an application, then the ODBCINI environment variable must be set to <InstallDir>/Teradata/client/<desired version>/odbc_32/odbc.ini for 32 bit or <InstallDir>/Teradata/client/odbc_64/odbc.ini for 64 bit, and that odbc.ini file must be updated accordingly.