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[Mariusz33217431kbe0]

[johnrellis]

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Google translation: "Downloading masking models. Some masking models are being downloaded. Please try again later."

When you first start LR 13 after installing it, it downloads some additional AI "models" (AI code) that Adobe decided not to include in the installer for some reason.  Your screenshot shows that LR doesn't currently have network access:

so it isn't able to complete the download.