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Synology NAS - DSM 6.1 & DSM 6.2
Install Synology DSM on Virtual Machine Manger - DSM 6.1

If you need to have DSM version where you can play around with Synology DSM then you shut look on Virtual Machine Manger as defualt i think you can have 1 or 2 Virtual Synology DSM to running, but you can upgrade by buying licens to Synology Virtual Manger.