Script to automatic download for Setup.exe

Not aware of a specific script but do check out https://github.com/OfficeDev/Office-IT-Pro-Deployment-Scripts/ and see if there is anything of interest.

Just generally, the Office 2016 Deployment Tool (ODT), can be downloaded from https://www.microsoft.com/en-us/download/details.aspx?id=49117 and easily configured with the new Office Customization Tool for Click-to-Run app, plus additional deployment guidance https://docs.microsoft.com/en-us/deployoffice/choose-how-to-deploy-office-365-proplus.