VCC or ALCOM should open now and ask to add
https://alanbacker.github.io/vpm/index.json.
Nothing happened? Make sure the VRChat Creator Companion (2.1.0+) or ALCOM is installed, then ➕ Try again
Manual install — VCC/ALCOM → Settings → Packages → Add Repository → paste the URL above.
手动添加：VCC/ALCOM → Settings → Packages → Add Repository，粘贴上面的 URL。
手動で追加：VCC/ALCOM → Settings → Packages → Add Repository に上記 URL を貼り付け。
수동 추가: VCC/ALCOM → Settings → Packages → Add Repository에 위 URL을 붙여넣으세요.