The filing instructions in the tax return download were not included; where can I find them?

I assume you are using Online TurboTax.   That's been a known problem for some users, and supposedly TurboTax just fixed it.  But I've still seen some others like you with the same problem.

I don't know if this will work, but it's relatively quick to try.   Try downloading your PDF at the Print Center inside your return.  If TurboTax think's you were finished, and your interview is closed, I'll tell you below how to open it back up:

NOTE:  When you open your return back up, do not make any changes in it if it's already been filed.  If you later have to amend the return, it has to start off exactly as it was when it was originally filed.   If it hasn't yet been filed, then you can continue working on it.

• Log in, and if your return interview is closed because TurboTax thinks you are finished, then at the Tax Home or in the section "Your Tax Returns & Documents" for 2024, look for a link "Add a State."
• Click on "Add a State."  (you don't really add one.  That's just to open your return back up.)
• After the return interview is open, click in the left menu column on TAX TOOLS, then PRINT CENTER.
• Then choose "Print, save, view this year's return."
• The next screen should offer some options:  "Just my tax returns", or "include government worksheets (optional)", or "include government and TurboTax worksheets (optional.)"
•  See if one of those PDFs has the Filing Instructions.  
• Please report back if that worked or not.

NOTE:  Remember all PDF tax documents and tax data files are very sensitive files, since they contain your personal ID info, financial data, and possibly bank account numbers, etc.  Be sure to store them safely and securely to guard against computer theft, hacking, etc.