Before I start, I'm a linux user so anything dealing with directories for windows and mac OS is based upon forum searches. Unfortunately this won't fix the problem if you don't have the following setup to start with.
(I'm not too good with using forums yet. So if you can give me tips on how to make this a bit easier to use, please post it!)
What you need, an installed version from this page:
http://wiki.spiralknights.com/Technical_issues_FAQ#What.27s_the_whole_li...
For this to work you need to have this installed and updated prior to a patch so that when the patch comes out you will only be needing a few minutes to install the much smaller patch as opposed to reinstalling the whole game as the browser launcher seems to be doing.
When the update comes out just update the non-browser version on your computer. Note the directory it installs to!
The locations you will be copying from and to are different for every operating system and the respective versions, but here's a few install directories I found. These are where you will be copying *to* (a.k.a. the browser's cache folder):
Windows: the parentheses are my guess as to the specific version (if I'm wrong please post a correction)
C:\Users\%username%\AppData\LocalLow (Windows 7)
C:\Users\AppData\Roaming\Three Rings Design\Spiral Knights (Windows Vista)
C:\Documents and Settings\Application Data\spiral (Windows XP)
Mac OS:
~/Library/Application Support/spiral
Linux (Ubuntu using sun java 6):
home/%username%/.getdown/spiral
Once you have the update done on the non-browser version just copy the whole directory into your browser's cache folder.
I'll be watching this thread responding to the helpful posts and ignoring the unhelpful ones.
use steam