2018 Requires 10.12 or higher.

2019 will require 10.13 or higher.

(TurboTax supports the Mac versions that Apple supports with the Apple developer tools and Apple will drop 10.13 from the tools before the 2019 version is released.)

I am running Catalina 10.15.2 but it will not open the download. Message reads "cannot be opened because Apple can check it for malicious software.  Any suggestions? What to do?

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@refactor wrote:

I am running Catalina 10.15.2 but it will not open the download. Message reads "cannot be opened because Apple can check it for malicious software.  Any suggestions? What to do?

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See this TurboTax support FAQ for the error received using your Mac - https://ttlc.intuit.com/community/troubleshooting/help/turbotax-for-mac-won-t-open-when-installed/01...

I have MAC OS X EL Captain.  Version 10.11.16.  Will this version of Mac OS work with the 2019 Turbotax download file? 

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@str8cash wrote:

I have MAC OS X EL Captain.  Version 10.11.16.  Will this version of Mac OS work with the 2019 Turbotax download file? 

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No.  10.13 or later is required as answered already in this thread.

I want to download a copy and print it for mail

@pieces123 Here are instructions if you need to print your 2019 return for mailing: How do I save my 2019 TurboTax Online return as a PDF?

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@farrowsimonr

Please see this TurboTax link for minimum software and browsers for Mac: Minimum Operating Systems and Browsers