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 2.3.3 stable in latest Joomla (3.10.2) Protostar php7.4.15
Personally I use t4_B5 template with t4_system plugin framework with bootstrap 5 and fontawesome)
(I prefer free "Signal" or paid "Threema" instead of "Whatsapp".)
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