a. File Backup Login to Blogger> Templates> Backup / Restore> Download full template.
b. File Upload When you are ready to install a theme, you must first upload the theme file. The theme file can be uploaded in 2 ways.
First way: Login to Blogger> Templates> Backup / Restore> Choice File Open your purchase folder, you will see a folder with name *** - template-XML Click the "Upload" button, wait a minute until the installation process is done.
Second way: Open
the XML file with a text editor (Notepad or something like that). Then
select all text and copy (Ctrl + A, Ctrl + C in Window). Return to your blog dashboard, access your Template menu, click Edit HTML. In
the HTML Editor window, select all old code and paste the new code that
you copied from the release file into the code field. Then, click Save
Template.