即使产品已停止销售，已购买正版的用户依然可以合法下载安装程序。需要注意的关键点是：。
Offline activation is possible through several legitimate channels, from standard serial‑number activation (with an initial online check) to true offline workflows using request‑response codes for air‑gapped machines, to volume licensing certificate‑based deployments. However, users should be mindful of the product’s support status, plan for future operating system compatibility, and always obtain their software from legal sources. adobe acrobat pro 2020 offline activation
