Thanks for the clarification. Could you please try the following and let us know if it helps:
- Update Lightroom to the latest version available on Windows.
- After updating, restart your PC and test opening Lightroom while completely offline.
If the issue persists, please share a short screen recording showing:
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Lightroom being launched while offline
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The photos not loading
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What happens once you reconnect to the internet
This will help us better understand the issue and investigate further.