Nature modpack updated to v1.6 to include Shaders, Optifine, and Journeymap. Optifine will complain about having an update. The new update for it (D1) has a problem with transparent backgrounds on glowing foregrounds (potion bottles for example) so I backed up to the C1 version which doesn’t have this issue. Ignore it, when there is a more stable update I’ll push it out.

Cheers!