@Poliakov This is a false positive from Windows Defender triggered by the hosting site (Workupload) while Chrome was downloading it, which is why you see that .crdownload file in the screenshot.
The MalUri.A!cl alert just means Defender flagged the download link's web reputation, not that there's an actual virus in the file.
A .unitypackage only holds standard 3D models, textures, and Unity scripts—it doesn't even have .exe files or anything that could run malware on your PC
