Files are packed in a ZIP: with most operating systems you can use the rightclick menu to extract the files. Print the pdf templates easily across multiple sheets and paper sizes, using Adobe Reader (free application) with poster print.
This is the free foam pattern for Jaskier's lute from The Witcher netflix show! It's a great base to start off with eva foam crafting, as it's easy to assemble and understand. For my lute I used 10mm eva foam.
Credits to ceteiq (tumblr) for designing the decorative pattern seen on Jaskier's lute: https://ceteiq.tumblr.com/post/628803118601306112/the-design-on-jaskiers-lute
Pepakura files are also included, you can use them as an easy 3d preview, to help adjust sizing, or to help understand how to modify or make foam patterns using pepakura yourself.