There is a new beta version of these workshop materials available here: http://ronallo.com/iiif-workshop-new/
The same materials are available there in basically the same order. Please consider trying out that version and reporting any bugs. You can always return here if something doesn't work there.
Once you have a Presentation manifest you can use a rich client application to view the resource.
If you don't have your web server running, get it running now and make sure you can get to your manifest at this address: http://localhost:3000/manifest.json
We'll try our manifest in two viewers:
We can use each of these viewers as we go along further to test out properties and information we add to our manifest to see what features they enable.