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Where is the LMZ1x/EXT Thermal Resistance Estimate Tool

Application Note AN2020, Thermal design by Insight, Not Hindsight, refers to an LMZ1x/EXT Thermal Resistance Estimate thermal software tool. I can find a link to it in the TI tools web page but the link (http://www.ti.com/tool/lmz1x-lmzxextdesign-calc