Can't upgrade from iso

[Hi-Angel]

As I understand, this plugin has replaced fedup, but there's an important functional still missing: fedup could upgrade from an ISO (both mounted and raw), whereas this plugin can't.

This functional allows one to upgrade the system when there's a scarce of free disk space. Currently such systems can not be upgraded, because the only way one could try it is by setting up a local repository, and then following this instruction. But then there's a hitch: this still requires one to download all packages to be locally (which would mean trying to copy packages from an ISO to the system partition), which one can't do (low disk space).