I have been using TTax for a number of years, I have a Mac Pro running OS10.7.5 how can I still use this computer this year, cannot upgrade machines.

[JoceannaD · Accepted solution]

Because for Tax year 2016: Mac OS X v10.9 or higher (64-bit is required), you will need to upgrade to that for the C/D/Download Version.  However, you can use a Turbo Tax Online version.  I have included articles below to assist you in transferring last years tax information into an online version.
https://ttlc.intuit.com/replies/3299949
https://ttlc.intuit.com/replies/4831158

How do I back up my tax file in the TurboTax CD/Download software?
https://ttlc.intuit.com/replies/3332500
Find Your Tax Data File in Mac
https://ttlc.intuit.com/replies/3302441
Can I transfer my 2015 TurboTax return from my computer to TurboTax Online
https://ttlc.intuit.com/replies/5004619
How do I transfer last year's return in TurboTax Online?
https://ttlc.intuit.com/replies/3301662

[sdsaavedra]

I'm using screen-sharing on my old MacBook Pro with a newer machine the 2018 software is installed on. That way I can use all my old TT & other tax stuff alongside & with this year's higher-OS app. :-)Shawn