The Alice 1.5 update is live! Make sure that you have a recent version of the launcher. Just connect to Alice like the usual and you should update. The server address is the same, but if it doesn't work, use alice-15.sk89q.com NOTE:There appears to be a problem for Linux users that prevents the game from launching correctly. We're looking into it. To access Alice 1.4: Either don't update to 1.5 yet, or: You MAY want to backup your .skcraftalice folder first, otherwise it will be updated to 1.5. Click "Install from URL..." at the top and use http://update.skcraft.com/minecraft/stable/alice-1.4/update.xml. Connect to alice-14.sk89q.com
Also, getting this error when starting the 1.5 client: Edit: Removing Optifine didn't fix it. Seems to be a problem with the files in bin/natives, they seem to be for 32 bit Linux. Investigating...
Started with OpenJDK Java (instead of Oracle's Java), now getting less errors: My system is Xubuntu 13.04 amd64, java version is 1.7.0_25
Extract this file and put it in your bin/natives. (it contains natives for Mac/Windows/Linux so its a bit bigger, but it made mine work (Mac 10.6.8) http://www.mediafire.com/?wmqw9d676d4jge2
Bugfix for Linux: Update the LWJGL, because there is a bug which occurs if you use a recent java version.(0070071's solution is probably doing this)