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Unity Location of downloaded Asset files

You rarely need to access the files downloaded from the Asset Store directly. However, if you do need to, you can find them in the following paths:

macOS:

~/Library/Unity/Asset Store

Windows:

C:\Users\accountName\AppData\Roaming\Unity\Asset Store

These folders contain subfolders that correspond to particular Asset Store vendors. The actual Asset files are contained inside the subfolders using a structure defined by the Asset package publisher.

Reference: