You should install it using the normal file upload mode for extensions in Joomla!
In English you find that in the Joomla! administrativ backend in the menu
"Extensions" > "Manage" > "Install" and there the tab "Upload Package File"
(Sorry, I do not know the Greek translations of the Joomla! menus.)
Hi, sorry I don't speak and write in greek language. (I only learned the "old" greek language.
But I tried to install the language in joomla and in JEM.
a lot of words (e.g. from columns and dates) are translated, but e.g. the event description is in english letters and I don't know how to change that in joomla. event descriptions should work like articles in joomla. So there must be some settings. I hope, you will get some answers and hints from a greek user!
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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