This is a known problem. TurboTax support is working on a solution.
See this TurboTax support FAQ to request notification of the progress and when it is resolved - https://ttlc.intuit.com/turbotax-support/en-us/help-article/other-articles/turbotax-cd-download-mac-open-updating/L9W17ldlU_US_en_US
Still doesn't work for me and the link is not working now. please help