I need a copy of my return for this year (2019) but when I click download/print return it just takes me to a page that I had to print and mail (which I already did) help.

The IRS does not just send you a copy of your tax return upon request.  After a return has been filed and processed by the IRS they want $50 to mail you a copy.  You do not say how long ago you mailed your return to the IRS.  It takes at least 4 weeks from mailing to see anything about your refund on the IRS refund site, and several more before you actually receive your refund.

When you mail a tax return you should use a mailing service that will track it, like UPS or certified mail so you will know it was received.

Meanwhile, there is no reason you cannot go ahead and print out another copy of your tax return for yourself.

PRINT RETURN   You need to print a copy of your return?  Sign in to your account using exactly the same account and user ID that you used to prepare your return.
On the bottom of the screen find Your tax returns & documents and click on Show.  Click on the Year and Click on Download/print return (PDF)

You need your filing status, your Social Security number and the exact amount  (line 20a of your Form 1040) of your federal refund to track your Federal refund:   

https://www.irs.gov/refunds

when I go through the year and click "download and print" it does not give me a copy of my return, it gives me a copy of something I have to print and sent out which I already have. thank you.

You are posting from desktop Basic.  That means the files are on your own hard drive.  Did you save your return as a pdf?  You should be able to print out whatever pages you choose to print.

<a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/1901196-how-do-i-print-a-single-tax-form-in-the-turbotax-cd-download-software">https://ttlc.intuit.com/questions/1901196-how-do-i-print-a-single-tax-form-in-the-turbotax-cd-download-software</a>

<a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/1943980-how-do-i-print-and-mail-a-return-in-the-turbotax-for-windows-cd-download-software">https://ttlc.intuit.com/questions/1943980-how-do-i-print-and-mail-a-return-in-the-turbotax-for-windows-cd-download-software</a>

I  didn't get a download of my return [which must be mailed to IRS] How do I do this ?

@henry baum Please see the following instructions to retrieve a copy of your 2019 return: https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-turbotax-online-return-as-a-pdf/00/26234

I need a copy of my 2019 tax papers filed in 2020

This Turbo Tax FAQ will show you how to access your return.

How to access a prior year

If you can’t access your prior year's return, you can request a copy of her transcript from the IRS. IRS Transcript