Katawa Shoujo Act 1 v3 is currently mirrored for direct download at the following locations:
http://eeh.maji.easymodo.net/KatawaShoujo/
http://frozenheat.net/ks/
http://zenithblue.net/4ls/
http://www.prism.gatech.edu/~hlu36/KS_Act1_v3/