TurboTax 2014 and 2015 crash on Mac 10.13.4 (and later).
That is a known issue that seems to have been created by Apple with a change in OSX 10.13.4. There was no problem with OSX 10.13.3.
Since this is not a defect in the TurboTax software, but is due to a change that Apple made which causes an internal Apple java script function to crash while reading an embedded java script component in the TurboTax application, TurboTax will not be issuing any update to the TurboTax software. ( An update would be useless anyway since the software must be running in order to apply an update and the software will not run at all.)
TurboTax issued a "fix script" that no longer exists since all support for 2014 and 2015 have been dropped.
**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.**
