4I don't know of a way that you can put it on your iPad from a CD I'm afraid, and as far as I can see the developer has not released that game for iOS. Here is a link to games from that developer, and as you can see Bookworm is not on there:
PopCap Apps on the App Store
Download apps by PopCap, including Bejeweled Classic HD, Bejeweled Classic, Plants vs. Zombies™ 2, and many more.itunes.apple.com
Maybe you could try to find a similar word game?