Script / Automation Full Definition Download

Hi,

We enable Full Definitions Download and allow our client to download the full definition via internet, we enable this because some clients are outdated and had problem on downloading the full definition on their local GUPs.

Question:

-Is there a script or way to schedule the enable and disable of "Full Definition Download"

-What else might be the problem why client are not downloading the full definition on their local GUPs?