Originally Posted by Raze
The patch download on Steam will be about 33GB, with IIRC about 80GB total space required for the download and install process. Galaxy has not been optimised to minimise the download size, so it will be higher (the download for patch 7 to patch 8 was 37GB in Steam, for example, and 86GB with Galaxy).

The disk install size will decrease due to several optimisations (including a change of format for some of the game data) and some of the other updates included.
The patch 8 hotfixes are also fairly large (a little over 3GB total), though that isn't a significant portion of the difference.


@Gray Ghost:
For the patch 7 to patch 8 update, Steam required about 104GB total for the download and install process. As long as you didn't fill up too much of that space again, you should be ok.

If required, a program such as WizTree could help track down files and folders taking up the most space, some of which you may be able to delete or move to a different drive, etc.

That's a relief. I'll still have to delete a game or two I installed since finishing with my last playthrough, but at least it shouldn't be as much of a pain to manage this time around.