You are comparing prices for online TurboTax to the price for the CD/download. Does your computer meet the system requirements to use the CD/download? You need a full PC or Mac--not any kind of mobile device.
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-system-requirements/minimum-syst...
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