Unity error: "Transfer Failure Unexpected Error. An Error occurred during a reading attempt on the media."

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Environment:
This error usually occurs when the user is trying to transfer the authorization from one PC to another.

Possible Causes:

1/ This error is sometimes seen when transferring authorizations between an older and a newer version of Unity Pro.

2/ The problem could be an incompatible USB stick.

3/ Is the USB stick write protected?

4/ Is the version of the USB compatible with the USB drive?