 The product 's license agreement allows home users to download , install and use it on an unlimited number of computers in their households free of charge , so long as each computer has a legitimately licensed copy of Microsoft Windows . Since October 2010 , small businesses have also been allowed to install the product on up to 10 devices , but use in academic institutions and governmental locations is forbidden , as is reverse @-@ engineering , decompiling or disassembling the product or working around its designed limitations . 
