A post appeared on this blog:

https://blogs.msdn.microsoft.com/mssmallbiz/2016/07/10/how-to-download-all-of-the-free-ebooks-and-resources-in-my-free-ebooks-giveaway/

along with a very long list of booklets to download… I am grabbing them all, so below is a small download script. By the way, it shows two methods of downloading files:

Start-BitsTransfer -Source "http://www.mssmallbiz.com/ericligman/Key_Shorts/MSFTFreeEbooks.txt" -Destination "filelist.txt" -Priority Low -ProxyUsage SystemDefault -TransferType Download
Get-Content "filelist.txt" | ForEach-Object {Invoke-WebRequest $_ -OutFile $(Split-Path $_ -Leaf)}