Bought it since I saw the "single copy" option mentions an epub.<p>You can't download an epub it seems. It's not attached on the receipt, and you seem to be forced to use the horrible gumroad reading site.
The link doesn't go anywhere. Probably meant: <a href="https://fractaledmind.gumroad.com/l/sqlite-on-rails" rel="nofollow">https://fractaledmind.gumroad.com/l/sqlite-on-rails</a>