The cache auto-downloads he literally said that right next to the download link
Client sided UpdateCache.java the link is there if you can't find it here..
https://dl.dropboxusercontent.com/s/...orage.zip?dl=0
Not that hard to fix, it's a decent looking base as always you'll need to fix something.
It looks like either the login box is not there or it is not being loaded from the client correctly. Check if the images for the login box sprite are in the cache and if they are make sure the client is loading them correctly look for "titlebox" in client.java
OT:
Looks like a decent release I really like how everything looks, thanks