Yes, you can often use a temporary email address to download a free ebook or another digital resource, provided the website accepts disposable addresses and its terms allow this. However, whether it is a suitable choice depends on how the resource is delivered and whether you will need future access.
Some websites display a download link immediately after you submit a form. Others send the file by email, require email confirmation, or create an account where the resource remains available. Understanding that process helps you decide whether to use a temporary inbox or a lasting email address.