A Microsoft file hosting and synchronization service.
The only "solution" I found was using 'Internet Download Manager'. This is a paid service, but a trial version is available for those who only need it for a 30-day time period.
https://www.internetdownloadmanager.com/
It partitions the download, each with OneDrive's massive 1-3 mb/s download speed.
These add together to create a faster download.
Currently I am downloading a 146-gig file, partitioned into 8, with a total download speed of 20-25mb/s.
I hope this helps someone.