Here's my response to you in that other thread post.
“If you used my link these procedures ALL work.
You are doing something wrong.
If you have a newer iDevice and downloaded the new version of Netflix, you go back to your older iPad, open the iOS App Store App. In the lower menu under purchased, tap and look for Netflix app in your list of purchased apps.
Tap the download “cloud icon”.
If the older versions of Netflix are still on the iOS App Store servers, you should get a pop-up message stating an older compatible version of the app is available for download and would you like to download it?
Tap OK and the older version of Netflix should download to your iDevice.
If you used my iTunes 12.6.5 method and were successful in downloading and installing iTunes 12.6.5, you then create a new iTunes library, log into the iOS App Store from within iTunes, using your Apple ID and password.
Look for the recent version of Netflix in the iOS App Store.
Download the new version of Netflix to iTunes 12.6.5 on your computer.
Once you have installed the newer version of the app in iTunes.
Go back to my above steps, open the App Store on the older iOS device, go to the Purchased option in the bottom menu, look for the Netflix app and tap the download “cloud icon”.
If the older versions of Netflix are still on the iOS App Store servers, you should get a pop-up message stating an older compatible version of the app is available for download and would you like to download it?
Tap OK and the older version of Netflix should download to your iDevice.
All three of my procedures ALL still work!”
Try one or all of these procedures, once again.