Application does not start

Tumblr Image Downloader requires that you have installed the FULL.Net Framework, version 4.0. If your machine is up-to-date with Windows Updates, this should already be installed. You can check whether you have it installed via:

• Open Control Panel
• Open Add / Remove Programs / Program Features
• Check the latest version installed

Or you can just download the latest update from the Microsoft website

Does it run on a Mac

Tumblr Image Downloader is a native Windows application. You can run it easily on a VM on your Mac / Linux box if you so wish. Using VMWare, Parallels, Virtual Box, Boot camp etc.