For anyone that wants to try, I figured out a way that works for me. It has worked for the past few updates. When the cmd black window pops up and refuses to close, leave it open. Hit "Ctrl + Alt + Del" and go to task manager. Under background processes, scroll down to "DTA Client" and click on it then end task. (Make sure you do this while the cmd window is still open). This process will close the cncnet client and allow the update to continue. The cmd window will close automatically when the update goes through! @nelsongmerino
I used to always close the cmd window manually at first, and then ctrl + alt + del to close the DTA client afterwards, and that never worked. I guess the client being open/running was inhibiting the cmd window from actively running/updating. No clue why.