CE needs about 120 Gb space to execute this update it seems.
Lots of us will have games installed on an older ssd beeing about 120 gb.
So… not enuf space steam said.
…deleted the conan folder in steam common apps and did a hail mary and restarted the update.
That worked, no questions asked. ( waah)
Not a nice way at all, but a way wich may help some of us.
No guarantees tho. Could mess up your steam internals logically , backup the lot.