That's too vague to answer.
Here's what I do know:
AutoKey is based on Python 2.7.x. I'm told that one of the many
improvements to Python 3.x is better handling of Unicode characters.
Most distros probably have AutoKey 0.90.4 in their repositories. I have
heard about one that has switched to the Python 3 branch. It may have
been Arch, but I don't remember.
If you want AutoKey 0.90.4.1, the only place to get it that I'm sure of
is from our GitHub project page -
https://github.com/autokey/autokey .
(It was added to the PPA for Ubuntu 14.04, but I'm not sure if that
works any more.) 0.90.4.1 was an informal bug fix release. I know that
several issues relating to Unicode were addressed.
The Python 3 branch has its own project page on GitHub -
https://github.com/guoci/autokey-py3 . Notably, they still have a
developer, so things get enhanced and fixed. (And when you ask questions
whose answers involve knowing AutoKey internals, there's someone there
who can answer them.)
I'm waiting on one of our list members to write up his install process
for autokey-py3 as I ran into difficulties trying to install it and did
not take the time to work through them.
Joe