You cannot put the software for a 2018 return on a phone or any other mobile device. In order to prepare a 2018 return you have to install desktop software to a full PC or Mac. Does your laptop meet the system requirements?
TurboTax 2018 Minimum System Requirements
Mac
https://ttlc.intuit.com/questions/1899173-minimum-system-requirements-for-turbotax-mac-software
Windows
https://ttlc.intuit.com/questions/1901571-minimum-system-requirements-for-turbotax-windows-software
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