The 1_download_assets errors in your screenshot are likely NPC sprites. I've noticed this issue in post #661 and post #674. Basically, I don't know how to fix it and I ignore those types of errors since they only affect the encounter episodes (the scenes that introduce a character as a new member of the protagonist's group) and harem introductions, not the harem scenes.
Thanks, I've managed to download everything from Nutaku, but I wonder how behind the current progress of story of Nutaku compare to DMM version ?
I would like to collect everything from Nutaku because they have uncensored content, but if it's too behind I guess I'll just collect DMM too to know what's new.
The Nutaku version of the game is about one year behind DMM according to the Japanese wiki's Event List. I haven't played the Nutaku version since April 2020, so I don't know if any features were implemented early, late, or not at all relative to the one year gap. Nutaku censored all of the harem scenes around October 2nd, 2023, post #638 mentions it when it happened. The pre-October 2023 uncensored JPG files are in the 'Nutaku assets JPG files' archive I've linked to in post #686.