Back in cyanogenmod, updates were downloaded to the cmupdater directory.
Then I could easily use twrp recovery to install the Upgrade.
But where does LineageOs store its downloaded upgrade files?
As of the new updates of August 31st, 2017, the updates are stored in
/data/lineageos_updates
Browse to folder:
/data/data/org.lineageos.updater/app_updates
edit: per comments below, this is outdated and the top answer is correct.
cmupdater
on storage dir ?