There is not need to update 2018 in order to transfer to 2019. All that is needed is the .tax2018 file.
Updating TurboTax cannot delete any .tax file, it does not have the capability to do so since the .tax files are totally separate from the software and are just like any other Mac file.
https://ttlc.intuit.com/community/tax-data-file/help/find-your-tax-data-file-in-mac/01/26206
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
