You can open an existing Revit file previously added to vault with the Revit Vault Add-in.
When selecting the latest version of a file, Revit Server files and Central work shared files are opened from their respective locations just as they would be if opened from Revit.
Opening a historical version of a file or a Read Only version of the file downloads a copy of the file from Vault and opens it for viewing.
Opening a non-work shared file for editing automatically checks out the file unless the Read-Only option is selected.
Each of the following conditions must be met to open a file from the vault for editing:
Open a Revit File from Vault