Because An American in Paris is a protected intellectual property, "free" PDFs found on file-sharing sites are often illegal and incomplete. To get a high-quality, professional script, look to these official sources: Licensing Houses
As for a PDF portable version, it's essential to ensure that you're obtaining it from a legitimate source to respect the creators' and publishers' rights. Here are a few options:
The musical features some of Gershwin's most iconic songs, including:
In 1949, Gene Kelly starred in the iconic movie "An American in Paris," a romantic comedy-musical directed by Vincente Minnelli. The film's success inspired a stage adaptation, which premiered in London's West End in 2014. The musical, also titled "An American in Paris," features a book by Craig Carnelia, music and lyrics by George Gershwin and Ira Gershwin, and additional music by Chris Wilkins.
Note: "An American in Paris" exists as both a 1928 orchestral tone poem by George Gershwin and a 2015 Broadway stage musical (book by Craig Lucas, choreography by Christopher Wheeldon). The spoken/dramatic script, libretti, and full score are generally protected by copyright. Below is a practical, lawful, and useful guide for locating, using, and sharing materials responsibly.