I am sure find the way about how to do that ,this is the link: Seeed-Studio/Adafruit_nRF52_Arduino: Arduino Core for Seeed nRF52 Boards. But it asked me to " 1. Install BSP via Board Manager as above to install compiler & tools." take the first step.
I find it strange because it is precisely I can’t download online that I thought of the way to download offline
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