57045: Acronis Backup Advanced 11.7/11.5 for VMware: Mounting Image Fails with "There are no letters available. Free up a letter and try again."

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Symptoms

  1. You have Acronis Backup Agent for VMware (Windows) installed on a machine.
  2. You try to mount a volume from a disk backup.
  3. Mounting fails with error:
    There are no letters available. Free up a letter and try again.

Solution

Install Agent for Windows on the machine where you want to mount an image.