The theme has been removed because it contained code not licensed under the correct license.
Please visit http://kahthong.com/node/17 to download the latest Fervens.
Quote from the original WordPress theme release here
Fervens is a 3 column theme that has a base idea of “freshness”. Summer is my favorite time of year as it always amazes us with a rainbow of sensation and colors, making this time of year the best of all. The green of the plants and trees, the blue of the water….I love this time of year :)