After installing version 126.96.36.199 of the AvaTax for Sage 50 connector, you are seeing the following error message:
""Unable to load DLL w3btrv7.dll": The specified produce could not be found. Expection from HRESULT: 0x8007007F"
AvaTax for Sage 50 188.8.131.52
Navigate to the following directory: C:\Program Files(x86)\Avalara\AvaTax for Sage 50
Rename the file w3btrv7.dll to w3btrv7x.dll.