In most of the cases, a "vault" application is working within a cloud which means that if your cloud account was synchronized with your PC and you have deleted the account, the files were deleted at the same time. Downloading a new vault won't fix the problem.
I recommend you to use R-Studio as it's most efficient tool for recovering lost items such as photos, documents or other files. Install the application then use the SCAN function to perform a scan for your deleted items.