We do not have any typical cache, logs or temporary files keep in client normally. Leftovers of patching process are normally cleared up by launcher.
Currently to gain some space free you can only periodically delete following directories:
- "screenshots" - if you don't need to store your Print Screen results
- "Crash" - if you get crash report sometimes
- "Log" - tiny logs of client startup
Other than that, our client is maximally optimized in size for amount of unique models and textures we have.
However, recently we started working on rebuilding game client structure, which may result in more efficient compression and so further reduced game client.
