The editor pulls data from all installed packs for reference and import and likely won't function properly without the core lancer data. v3 is newest, v2 is in version history on the GitHub repo. Just upload the .zip.

Where to find Packs: massif-press.itch.io. COMP/CON reads v2/v3. Foundry reads v2. Wallflower NPC LCP unlocks the experimental Eidolon creator.