"Insufficient memory to install update files"

[Tiramu]

When you go to storage under your macs info, what does it say? Your bootcamp isnt eating space, or any secondary partitions?

I would also go into "free up storage" from the storage screen and see what you can clear.

Macs can be a little weird registering storage sometimes.

Id also recommend asking on the Apple forums, technical types can be really helpful there. While its possible thay XIV is incorrectly claiming too much space or incorrectly registering the error, its probably more likely that its something MacOS side, so I'd try to check on that too.