This is a common question we get asked.
If you Google this, you will be given a number of different solutions!
The answer, however, is quite easy.
In Windows Explorer, navigate to C:\Program Files\Microsoft SQL Server\MSSQL11.AUTODESKVAULT\MSSQL\Log
Navigate to & edit one of the ERRORLOG files using notepad.
At the top you will see all the information that you need in relation to the SQL version installed for the Vault.