How do I access a pencast that has been shared with me if I no longer have the email?
If a pencast was previously shared with you via an email containing a link that took you to Livescribe Online, you would need the email to access the pencast once more. Have the sender share the file with you again via Livescribe Online.
You could also have the sender share the file with you directly using the send to "Computer" option in Livescribe Desktop. Please have the sender reference this article for more information:
80504 - How do I export my pages and audio as a Pencast using Livescribe Desktop?