After you make a purchase, we send you an email with download links. If you open that email in a web browser or email app, you can download your purchases without having to sign in to Leanpub.
After you make a purchase, if you switch to another browser or device, you will have to sign in to Leanpub. You can do this with the email address you used when you made your first Leanpub purchase, or when you signed up for an account.
You can sign in to Leanpub here:
https://leanpub.com/login
If you know your password, you can sign in with your email and password in any browser.
If you need to set a new password, you can do that in your profile if you are signed in, or you can do that here: