If you try to install on Joomla 3.5+, there's a problem.
It's because component's installer script doesn't know Joomla! 3.5.
You can manually fix it by changing the file script.php within com_jem.zip inside the package (yes, inside the zip inside the zip - sorry )[/code]
Change line 212 from
if (!(($jversion->RELEASE == '3.4' && $jversion->DEV_LEVEL >= '0') ||
if (!(($jversion->RELEASE >= '3.4' && $jversion->DEV_LEVEL >= '0') ||
(allow 3.4 or greater) and then recreate the component and package zip files.
In the coming JEM 2.1.6 this will be resolved
on JEM 2.3.0+ stable in latest Joomla (3.9.25) Protostar php7.4.15
Personally I use t4_stark template with t4_system plugin framework with bootstrap and fontawesome)
(I prefer free "Signal" or paid "Threema" instead of "Whatsapp".)
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