copy comsol_3.5.0.608_linux64.jar (for a 64bit system) or comsol_3.5.0.608_linux32.jar (32bit) to [your comsol installation (e.g. /usr/local/comsol35a)]/updates (create folder if it doesn't exist) and run './comsol update' in folder [your comsol installation]/bin

then copy comsol_3.5.0.608-p3_linux.patch to the updates folder and run the commands

patch -Rf -p1 < updates/comsol_3.5.0.608-p3_linux.patch > /dev/null
patch -p1 < updates/comsol_3.5.0.608-p3_linux.patch

in [your comsol installation] folder.

enjoy! simon