If you filed your taxes using the download version, then you must use that version to do your amended return also.
To amend in the Desktop program.....
First you need to update your return with the filing status so it knows it was filed and accepted. For the Desktop program you have to check the filing status inside the program.
Open your return and go up to menu item
File > Electronic Filing > Check Electronic Filing Status
Then save your return and close and reopen it.
The jump to search is tricky to use. If it isn't working on the Mac program, then open your return and it may say Amend on the first screen. Or maybe it will be before you open your return. Go to File-Open and before clicking on your return see if it says Amend somewhere.
Or after you open your return and make a Duplicate like the Amend FAQ says, go to
Federal Taxes or Personal (Deskop H&B)
Other Tax Situations
Other Tax Forms
Under File->Check E-file Status, my original return shows Accepted.
I created my amended return yesterday by opening the original file and under Manage Returns selected Amend a return (make changes). I made the changes.
Under File a Return, I see E-file (recommended). When I select this and hit continue, it says "Unable to e-file" with the following "It looks like you've prepared a federal amended return form 1040X. It also looks like you haven't e-filed the 1040 through Turbotax." This doesn't make sense since Check E-file Status shows Accepted. What am I missing here? I've tried saving and reopening.
I've seen people post that before. Don't think there is an answer. Try calling in. If you find out anything please update us.
How to contact Turbo Tax
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-contact-turbotax/00/26991
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632