Take the file and extract it in resource-packs folder in .minecraft.
Open up the game and enjoy!
If you want to combine it with other texture packs than just go to the last folder in downloaded file (blocks) copy and past all the glass files into your texture pack's blocks' folder.
As the title sais, I decided to create a new version of Torhan's clear glass and make it compatible for 1.8 stained glass.
You can view the video review here:
But.. You don't need to view the video, just download it already
http://adf.ly/1RbP8r
Insturctions:
Take the file and extract it in resource-packs folder in .minecraft.
Open up the game and enjoy!
If you want to combine it with other texture packs than just go to the last folder in downloaded file (blocks) copy and past all the glass files into your texture pack's blocks' folder.