Tuhi, your storage assistant · What Tuhi can do for you
Why did my Tuhi download pause because of low disk space?
Short answer: The drive it was going to ran low, so the download stopped rather than filling it; nothing downloaded is lost. Tuhi offers to carry on on a drive with room, keeping what's done, or free space and press Resume.
The place the download was going ran low on space, so it stopped instead of filling the drive completely — a full startup disk can make your whole Mac misbehave. Nothing already downloaded is lost.
Tuhi offers to carry on on a drive that has room, with a button for each one. The pieces already downloaded come along, so nothing is downloaded twice, and the finished file goes to the new place too. Or free some space yourself and press Resume. Open Details on the download card to see it in Data Transfers.
Tuhi checks the file's size against the free space before a download starts, so this mostly happens when something else fills the drive while it runs.