Thanks for your order.
To install the PRO theme
Go to the menu Appearance > Themes and click on Add New button.
Click on Upload Theme button.
Look for a file called business-web.zip Click on it to select, then click OK.
Click on Install Now button and wait until the installation is complete.
Click on Activate link to activate the theme on your WordPress site.
After activating Go to Appearance >> Theme Options >> click on Restore Default.
Please check the documentation
If sill getting problem, please send your website URL and WordPress admin login details at firstname.lastname@example.org
We will check and install PRO theme on your website so you can theme customize it.