Hi, i just purchased this component and installed it on my website and i see it does not support non-latin (Greek) characters. Is it something that can be fixed or any tweaks i can do in order to be able to have the alphabetic filter in Greek characters too?

Hi,
Thanks for using our extension!
You can translate alphabetic filter on file path: root / components/com_contentpress/views/category/tmpl/default_alphabet.php
in addition you should also add the Greek language files for that component (ex: en-GB.com_contentpress.ini)
Or please send info access to email: This email address is being protected from spambots. You need JavaScript enabled to view it. I'll check and add this.
Regards,
Kien

Thank you that worked! I have one more question. Is there a setting or way to hide letters that have no articles or show them as inactive or other color?

General configuration only when hidden throughout the entire filter letter, not function as you ask.
if you do, then we need to check all the entries under each letter. This will cause very slow to load data.