The TurboTax CD/download can only be used on a full PC or Mac.
You can put the Online version on the iPad.
Desktop download software cannot be used on an iPad. Only a full PC or Mac meets the system requirements.
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-mac-software/00/25609
If you do not have a compute that meets the system requirements, then seek a refund for the download. Use online TurboTax instead. You cannot pay for online with the license key.
ONLINE 2024
https://turbotax.intuit.com/personal-taxes/online/
To request a refund for a TT product
https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-refunds/request-refund-turbotax-product/L834M6uyW_US_en_US?uid=m6meybc2