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Buy H&R Block Tax software instead. It costs less and will work with your older version of macOS.

Their top end product, H&R Block Tax Software Premium & Business, does not support macOS. Seems odd the other 3 versions of H&R do support macOS but not the Premium version.

Thoughts anyone?
 
It is a traditional IRA.

Won't use online filing because of security concerns for NPPI data....

Do you seriously think online tax prep companies, any of them, are less secure than a government agency? Hah!
 
I was able to use hexedit to NOP out the OS version check call and got TurboTax 2018 to start up without displaying the "no longer supported" error window. It still warns that next year's application will require 10.13, but I will worry about that next year. Here is the gist of what I did -- assumes a basic knowledge of terminal and simple hexedit commands:

% cd /Applications/TurboTax Home Business 2018.app/Contents/MacOS
% cp TurboTax\ 2018 TurboTax\ 2018_backup
% hexedit TurboTax\ 2018

Original
0001B800 00 00 00 48 8B 7D F8 E8 64 03 00 00 E9 00 00 00 ...H.}..d.......

Modified
0001B800 00 00 00 48 8B 7D F8 90 90 90 90 90 E9 00 00 00 ...H.}..........
 
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