Alright, so I ran the updater on two mods (Bubbet's Placeholder Mod and Redstone's Diffusion Shields), but I'm still getting the same errors as when I had tried to run them prior to updating. I've gotta be missing something- my process is:
Unzip old mod -> use the 0.14.10 mod upgrader on it -> zip the new folder -> install the new zip in Cosmoteer
logs on request in case I'm not actually forgetting a step, otherwise I'd just post it (via Pastebin)