The latest firmware:
The latest drivers:
Caused by Availability of SHA-2 Code Signing Support, maybe you can install the drivers on Windows 7 64bit OS. Please go to below link to download Security Update for Windows 7 for x64-based Systems (KB3033929) according to Microsoft Secutiry Advisory 3033929.
Find the details as below link:
You also can download the installation programmer here directly:
Guide for Working with OBS:
OBS Studio download: