Mouse buttons not working
I just upgraded to OS X 10.11 on my latest gen iMac. I have a Microsoft Wireless Laser Mouse 5000, which has 5 buttons. I have the latest Microsoft Mouse driver software installed, 8.2. This is pretty old driver software actually, it hasn't been updated in years. Using the System Prefs> Configuration Panel I have always had buttons 4 and 5 set as 'Back' and 'Forward' respectively, allowing me to go back and forward on web pages. Up until 10.11, these buttons continued to work as they always had. But now, in El Capitan, they no longer function at all. I reinstalled the mouse 8.2 software, still no luck.
Apple's built-in mouse driver only allows for 2 buttons. I recognize that Microsoft should really update this driver software after all these years, but I'm guessing they won't for a while, if ever. Is there other mouse driver software for El Capitan that I can install to regain the use of my extra mouse buttons?
iMac, OS X El Capitan (10.11)