Please follow below mentioned steps to do basic clean-up instead of uninstalling full application. You would need an active internet connection (wired connection is preferred) for below mentioned steps.
1. Close TurboTax
application by pressing Command + Q keys.
2. Single click on
empty area on Desktop and press Command + Shift + G keys. Type ~/Library in
text field and click "Go".
3. Now, navigate
to "Application Support" directory and select
"TurboTax Deluxe 2017". Remove "Forms" directory under it
by dragging it to Trash.
4. Navigate back to
Library directory (using back button "< icon" on Title bar or follow step #2) and select "Caches" directory. Remove
"com.intuit.turbotax.2017" and "TurboTax Deluxe 2017"
directories by dragging them to trash.
5. Empty Mac OS Trash
directory by right click on Trash Icon and select "Empty Trash" option.
6. Restart your mac
machine. Check internet connectivity on you machine.
8. Launch TurboTax Deluxe 2017 application by navigating to
/Applications directory.
9. Let Product &
Formset update to download & install, if available any.
10. Verify if you are
still getting the same error message.
If you are still
facing error message then reach out to care for more help. Click here for one-on-one help from a live TurboTax Expert, CPA, or enrolled agent. We're open 7 days per week from 5:00 AM to 9:00 PM PST.