If you intend to produce the play, you do not need a PDF for reading; you need a license. Concord will sell you perusal copies (physical or digital) strictly for reading. They will watermark these heavily, but they are the definitive "acting edition."

If you're looking for a PDF of the full play, I can suggest a few options:

The full script for Duncan Macmillan’s , a drama about a couple discussing parenthood amidst climate concerns, is available for purchase and through digital library platforms. The play is known for its minimal staging, fast-paced dialogue, and significant productions, including one starring Matt Smith and Claire Foy. You can purchase the script on Amazon or Google Play Books . Lungs - by Duncan Macmillan - UVA Drama

Notably, the film adaptation added production value (lighting, rain, revolving stage) that the script explicitly avoids. Watching the play helps you understand what the PDF implies —namely, that the IKEA setting is a metaphor for the disposable nature of modern relationships.