Catch 22, Apple don't seem to report free space correctly and when they want to download something they need the space for the download, the "working files" and the installation.
They want to make a change it takes up more room than the final item so they go and just delete stuff they think you don't need or can replace.
All good fun
Go shout at Apple, maybe they'll finally stop.
Android so far hasn't done this to me, but my Amazon Kindle needs a re-install to update and if I check on what I can remove to make space it only offers the option to delete the TSTO data - It's an older Kindle with not much room and if the OS updates take much more it won't even fit a fresh install !!
Glad I've got good WiFi !!
