You can download a copy of the Amplified Bible for free at The Lockman Foundation website, provided you meet their software requirements. The website offers a Quick Bible Amplified option, which allows you to quickly search a verse, term or short phrase.
The Quick Bible Amplified download is free for registered users, as of 2015. The Lockman Foundation claims to maintain high quality translations, as its motto is "The Standard of Biblical Excellence." There is an entire catalog of Bibles available on the Lockman Foundation website. The Amplified Bible is a popular translation amongst clergy due to its simplified language and use of metaphors to enhance understanding.