It was just updated so my bet is the old version was deprecated. I have yet to see anyone write of how to get the old version to work.
Today I had a very important video call with 6 other people, and I was not able to hear or see anyone (except for one person).
I used the old version of Google Hangouts as I always did and it used to work perfectly fine, including just last week.
And I use the old version because it has more options and it has the chat option. I do not even understand why Google made this new version anyway.
When I finally tried the new version it worked and I was able to see and hear other people.
Of course I do not want to continue using the new version of Hangouts because it is really bad.
My laptop is a brand new Leno Y5070
OS: Windows 10, 64.
I do not have an anti virus, and my Firewall is off.
I tried Opera, Chrome, FireFox, and Internet Explorer.
I have the Google Hangouts plugin installed and allowed.
Thanks a lot for the help!