https://github.com/johanneszab/TumblThree

For downloading liked photos and videos, you'll have to do some steps:

1. Go to Settings, click on the Connection tab and fill in your tumblr email address (login) and password, then click the Authenticate button. If the login was successfully, the label will change and display your email address. The email address and password are not stored locally on disk but cookies are generated and saved in %LOCALAPPDATA%\TumblThree in json format.
2. Add the blog url including the liked/by string in the url (e.g. https://www.tumblr.com/liked/by/wallpaperfx/).
3. For downloading your own likes, make sure you've (temporarily) enabled the following options in your blogs settings (i.e. https://www.tumblr.com/settings/blog/yourblogname):

• Likes -> Share posts you like (to enable the publicly visible liked/by page)
• Visibility -> blog is explicit (to see/download NSFW likes)