2. Extract the .zip file, you’ll get 2 files named “wordpress-importer.php” & “parsers.php”.
3. Replace those new files with the same file name in wp-content/plugins/tlg_framework/includes/lib/importer folder.
Then you can try to import the demo content again. If the problem persists, please share us the admin account of your site via private reply so we can investigate your case and help you out. Also, please point to specific page where we can see the problem. Any screenshots would be welcomed!
We’ll add the latest version of WordPress Importer in next update of the theme.