Please send me the link where I can download and install Teradata Schema Workbench on my local machine.
First, have you completed training for TOLAP (TBIO)? This must be done prior to getting instructions on the download process. I sent you a DM with the OCI, which includes links to training.
OCI: http://teradatanet.teradata.com/redir.html?assetId=KA60855 (in particular, section 10 covers much of the pricing and licensing for the product, including evaluation copies)