On August 16 the last patch of "Pillarsof Eterity II, Deadfire" was released, but in Linux the update is not yet available. We can download the whole game, but it does not make sense to download 21GB for a simple update.

I'm also waiting for this patch on Linux.
I have a very slow DL speed and don't want to download the whole installer (took me 2 days last time)...
Especially considering that the 2.0.1 patch is a very minor one with only a few corrections.

Nineteen days late, but finally the patch is available.

We still do not have the patch 2.1.0 that came out on September 11 or 3.0.0 that came out yesterday.

Why do Linux users have to download a 21 Gb file every time there is an update?

If at least we had Galaxy available.

Edit:

They have uploaded the update patch from version 2.1.0 to 3.0.0 but as the patch that updates from 2.0.1 to 2.1.0 is not yet available, we still can not update the game.

And GOG made an error in the patch list.
Currently, latest patch is referenced as 2.0.1 => 3.0, instead of 2.1 => 3.0.
I agree we need the 2.0.1 => 2.1 patch, without this one the upgrade to 3.0 is impossible from anything before 2.1.

I notified support of the error of the patch 3.0.0.0018 and the only solution that they gave me is to reinstall the 21Gb of the game.

They just released a new 2Mb patch, 3.0.2.0027, and when I try to install it I receive the message "Verifying archive integrity...Error in MD5 checksums: 37f2758c8048d20d1a75442ffb0fdbd3 is different from 8e113474ef8b8d6f36984cd06d777224" I hope I do not have to download 21Gb again.