Here is the Readme which has the location.
For installed Vault Basic 2013 64 bit:
1. Copy file "VaultAddInRes.dll" and “VaultClientRes.dll” from your Vault Basic Client installation folder (If you use DVD then the location is from that):
"(Your installation folder)\x86\[lang-lang]\Vault\Program Files\Autodesk\Data Management Applications\Office Addin 2013\"
2. Navigate to the folder below:
"C:\Program Files (x86)\Autodesk\Data Management Applications\Office Addin 2013\"
3. Paste "VaultAddInRes.dll" and “VaultClientRes.dll” to above folder overwriting the existing files.
Hope this helps!
From where did you install the Vault Basic? If you have installed it from CD please check the location at the CD.
I downloaded the software from the Education Community using the Install Now method.