you should be able to unzip/untar them, put them all in one folder, say, games?
then upload the folder with them in it, you can then acess it by your server, the directory, then the game.php file.
example:
http://artevo.ulmb.com/games/3d_Net_Blazer.php
or in another case, the link might be different from the forum, not sure how this goes along, probally an option on your forum to install them?