Our website gives users the ability to download data but this data can't be downloaded to a mobile device. For the mobile viewport widths of our site I'm considering these options:
1) Remove the download button entirely or disable it.
Assumption: a user might think the feature has been removed or that they somehow lost access to it.
2) Inform the user to login from a laptop or desktop computer to download data.
Assumption: User might get frustrated that a button doesn't lead to the promised functionality.