In both instances they are an RC Release, due to the changes between Elkarte 1.1 and Elkarte 2. 0 a new version is needed as the namespace is completely changed between the two.
Followed that hyperlink which said to work with 1.1.x
Quote from: tino – What version of PHP were you running? is_countable was introduced in PHP 7.3 and I would expect most places to be on that by now.
OK ... that explains it then, since the server is way behind the updates for reasons I don't even want to know and I don't run the box, it's in much more knowledgeable hands of my friend, so I cannot do anything but relay this to him.
Server is in process to get some love and updates so when that happens things will work