to save time downloading, can i copy paste the installer of ToS? my cousin going to download the 4gig client then i can just copy paste that after i activated my beta key on my steam?
Please use the search function, there is already a thread asking how to transfer games from steam on a pc to another pc with steam. 
This post was flagged by the community and is temporarily hidden.
Please just press CTRL + F and type the words
steam copy
2nd search result.
Here you go