Hello @김경원,
Welcome to Microsoft Q&A forum.
For activating VS or signing in VS offline, there are two methods:
- Connecting to network and signing in VS periodically.
- Using a product key.
I also prefer not to download an offline key.
You need to use offline keys, if connecting to Internet and signing in VS periodically are not possible.
See the note mentioned here: Update a stale license
If you are using Visual Studio for extended periods in environments with limited or no internet access, you should use a product key to unlock Visual Studio to avoid interruption.
Sincerely,
Tianyu
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