Pillars of Eternity v3.01.977
The White March Part I v2.00.0706
The White March Part II v3.00.967
You need to download the new v3.01 installers for White March parts 1 and 2.
PS: This is what the three installers for v3.01 are called:
gog_pillars_of_eternity_2.11.0.15.sh
gog_pillars_of_eternity_white_march_part_1_dlc_2.5.0.7.sh
gog_pillars_of_eternity_white_march_part_2_dlc_2.1.0.2.sh
And yes, it is super annoying that GOG uses their own versioning scheme rather than including the official versions in the installer filenames. I've already complained to their customer support about it.
Ineth's post in [Linux] graphic bugs with v3.01.977 was marked as the answer