Learn to play note-by-note 100 licks of Wojtek Deregowski. Get also 5 bonus licks from other transcription books.
You will find the video playlist at https://www.youtube.com/user/jesmat2006/playlists.
Gumroad has to process the PDF file and apply an individualized stamp. This is called PDF Stamping. This can take from several seconds to several minutes, depending on the size of the PDF file. When the PDF stamp is ready, you will receive a download link in your email receipt.
Also, since it is PDF stamped, you will not be able to read your ebook through your Gumroad library. Instead, you can download the ebook and read it through any device you choose.