Free unlicensed version of tmux-autocomplete can be downloaded here.
tmux-autocomplete may be downloaded and evaluated for free, however a license must be purchased for continued use. There is currently no enforced time limit for the evaluation.
|Ubuntu, Debian, …||.deb|
|Fedora, CentOS, …||.rpm|
Install package using package manager. If you don't know how to do it, consult docs page regarding this topic.
Now open terminal, enter tmux-autocomplete and follow instructions.
Visit documentation for information about themes, keybindings and much more.