Step 2: Extract Template File from Downloaded ZIP
Extract file from zip using your favorite app. Inside this zip you'll find a single file cptemplate.php
Step 3: Upload Folder with Files to BeTheme Root Folder
Using your favorite FTP client app (e.g. FileZilla) or File Manager in cPanel upload extracted cptemplate.php file to Total theme root folder. It is recommended that you utilize child theme, so your Total child folder would be /wp-content/themes/Total-child/
You're All Set
That's it. Custom Page Templates plugin will automatically scan theme folder and find the uploaded cptemplate.php file. This file will be used for all custom page templates you create in wp admin.