Not for 2019. That message you received, if you read it carefully, is telling you that NEXT year when the 2020 software is released, it will require Mac OSX 10.14 (Mojave) or higher. 2019 requires High Sierra (10.13) or higher.
The message is just to alert you that to use TurboTax NEXT year it will require that you upgrade so you have a year to do so.
**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.**
