"You have used your space quota." error on install

The export from the old site worked just fine. I’ve got my Zip file. When I try to install it on the new site I get “You have used your space quota. Please delete files before uploading. Back”

* I am able to install other themes from within the WordPress system (i.e. not by browsing and uploading.)

* I’m installing it to a multi-site system so I’m installing it at the network level. Even so, the site I’ll be using it on has an overly karge upload quota.

Any ideas?

https://www.ads-software.com/plugins/theme-downloader/