You can't install the MAC version on Windows or vice versa. You can contact support for assistance.
This FAQ will provide you with the steps to contact an agent.
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
Where can I obtain authentic TurboTax programs?
https://ttlc.intuit.com/community/choosing-a-product/help/where-can-i-buy-the-turbotax-software/00/2...
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