For the official 2015 stage musical script (book by Craig Lucas), digital versions are restricted due to licensing.
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: an american in paris musical script pdf portable
Before you commit to buying the PDF, let’s look at what the digital file actually contains. This is not the film script. For the official 2015 stage musical script (book