Update: Have tested on an older version of ubuntu (14.04) 

Installed apache2/php/php-curl 

Updated updated website in the script + rehashed. Still getting error above.  Have the PHP source files been updated? Do I need to purchase again to get updated files? 

hello, i just updated the source, just replace the index.php. You can download it again from "Purchase History"

HI Daniel, 

I just downloaded the files again and placed in the root dir /var/www/html

Now I am not getting anything, I can see it is going out via the apache access log. 

Got a error below.

php index.php 

PHP Warning:  Undefined array key "link" in /var/www/html/index.php on line 3

PHP Warning:  Undefined array key "search" in /var/www/html/index.php on line 4

PHP Warning:  Undefined array key 1 in /var/www/html/index.php on line 6

I have rebooted my server too just in case as it had updates it needed, still no luck.

Edut

Tested on another server running php 7.4.3 

php index.php 

PHP Notice:  A non well formed numeric value encountered in /var/www/html/counter.php on line 5

PHP Notice:  Undefined index: link in /var/www/html/index.php on line 3

PHP Notice:  Undefined index: search in /var/www/html/index.php on line 4

PHP Notice:  Undefined offset: 1 in /var/www/html/index.php on line 6

If you try another server put All the Files from the archive.

Edit:

Download it again, made some other modification for the rest of warnings that may appear.

Okay give me a moment, I will download again and upload to the web server for testing 

Edit: Working now - Not sure what happend there, was the script updated?