I moved the game from Location D to C. Now game says i have to download

Hi there, 

You can try some steps to make the EA app recognize the game files that you already have installed. Please take a look below:

1. Open the EA App.
2. Click the menu (≡) in the top-left > Settings > Download > Install Location
3. Select the desired location
4. Go to your BF1 game in the EA App and start the download
5. Let it download until 1% or 2%, then pause the download.
6. Move your Old BF1 folder to the new location you've selected
7. Go back to the EA App and resume the download.
8. It should now verify the existing files instead of downloading everything again.

I hope this helps.