Sorry, but you will find it not possible to run Mac 2014 or 2015 in a Mac OS later then 10.13.2.
Apple released OSX 10.13.3 and it caused an internal *Apple* java function to crash when reading an internal TurboTax start up script. Apple took no responsibility and it was not possible to issue a TurboTax update to correct it because you cannot update software that will not run .
TurboTax developed and released a Unix script that could be run using the Mac Terminal utility to remove the startup scrip so 2014 would run, but after TurboTax dropped all support for 2014 & 2015 after 3 years, that scrip disappeared also.
**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.**
