Too much trouble with this incident. At the date 30/10/2019, the skype for business plugin installed at :
1
%localappdata%\Microsoft\SkypeForBusinessPlugin
the MSI built on 03/08/2019.
skype plugin version - 16.2.0.511 server version - 7.0.2537.0 client version - 2019.0718.1001
keywords : SkypeMeetingsApp.msi Join Skype Meetinghttps://meet.lync.com Skype Meetings App
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To make it work you must have Internet Explorer 9 or above, offline installers, for Windows 7.
x64 - http://download.microsoft.com/download/C/1/6/C167B427-722E-4665-9A40-A37BC5222B0A/IE9-Windows7-x64-enu.exe x86 - http://download.microsoft.com/download/C/3/B/C3BF2EF4-E764-430C-BDCE-479F2142FC81/IE9-Windows7-x86-enu.exe
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Microsoft page for client requirements : https://docs.microsoft.com/en-us/skypeforbusiness/plan-your-deployment/clients-and-devices/meetings-clients
The Firefox / Chrome browsers using the same addon that requires Internet Explorer v9 or above.
origin - https://www.pipiscrew.com/?p=15621 skype-for-business-requires-internet-explorer-9-or-above