If you used the 2018 Online or Downloaded versions then you can buy the 2019 Online or Downloaded versions and transfer the 2018 info to the 2019 program. For the Online version you must log into the same account used in 2018 for the transfer to happen automatically.
For the 2019 online editions - https://turbotax.intuit.com/personal-taxes/online/
For the 2019 desktop CD/Download editions - https://turbotax.intuit.com/personal-taxes/cd-download/
