PROBLEM:
You tried to install ListingPro theme from the WordPress admin, but getting the following message, Are you sure you want to do this? Please try again.
Please be advised that this is not a theme issue or bug.
SOLUTION:
OPTION 1: Upload theme manually via FTP and avoid the default WordPress installer from the admin dashboard.
OPTION 2: Contact your hosting provider and request to increase the PHP limits to the maximum.