This is a false positive, occurs with some antivirus because Plagius is not in their list of trusted programs.

If you receive a message of antivirus at the time of download, you must force the download, each antivirus has a different option for this.

We recommend inserting the Plagius in the exception list (white-list) of your antivirus, or even disable it to use the Plagius. Some antivirus interfere with the functioning of Plagius.