As Windows 10 becomes more and more popular, there will be more compatibility issues that arise as it is adopted into the workplace and enterprise. There are many reports of Cisco’s WebEx not working in Windows 10, in any browser. There are a few different error messages you may see, including: “Invalid input or system error. Please try again or contact your site administrator.” or “Windows cannot find ‘C:PROGRA~3WebExWebEx500atinst.exe’. Make sure you typed the name correctly, andthen try again.”
From what I’ve read, you can download the software needed from WebEx and even try it out in their test environment and everything works out fine. However, when you try to join an actual meeting, you’re hit with either of the errors above.
Luckily, there seems to be a workaround to make WebEx think you’re using IE10. Depending on your browser of choice, you have a couple of options.
Internet Explorer 11 (IE11) or Microsoft Edge
If you’re using either of these browsers, try using F12 for Developer Tools, then click on the Emulation tab. Finally, set your User Agent to Internet Explorer 10. After selecting Internet Explorer 10, the webpage will reload and the meeting should allow you to join.
Hopefully Cisco will release an update for WebEx soon that will fix the actual problem, but until then, please leave comments below and let me know if these solutions worked for you or not.