1. Click on the Download button and save file to PC (.xml format).
2. Log in Blogger dashboard.
3. Go to Design section → edit HTML.
4. Click on Download Full Template to Backup your previous template.
5. Upload a template from a .xml file on your hard drive by click Choose File option button.
6. Click Upload button, a confirmation message will appear. Click on Keep Widgets.
7. Now you're done.