Live site php 5.6 to 7.3 mysql to mysqli error

I have attempted to upgrade the PHP from 5.6.40 to 7.2.39 I get the following error; Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /var/www/vhosts/DOMAIN-NAME/httpdocs/include/adodb/drivers/[login to view URL] Stack trace: #0 /var/www/vhosts/DOMAIN-NAME/httpdocs/include/adodb/[login to view URL](182): ADODB_mysql->_connect('localhost', 'SITENAME', 'ICbi89sJl7...', 'SITENAME') #1 /var/www/vhosts/DOMAIN-NAME/httpdocs/include/[login to view URL](40): ADOConnection->Connect('localhost', 'phonehospital', 'ICbi89sJl7...', 'SITENAME') #2 /var/www/vhosts/DOMAIN-NAME/httpdocs/[login to view URL](3): include('/var/www/vhosts...') #3 {main} thrown in /var/www/vhosts/DOMAIN-NAME/httpdocs/include/adodb/drivers/[login to view URL] on line 210 I tried changing config file mysql to mysqli but it brings up a different error as below; Fatal error: Uncaught Error: Class 'ADODB_mysqli' not found in /var/www/vhosts/DOMAIN-NAME/httpdocs/include/adodb/[login to view URL] Stack trace: #0 /var/www/vhosts/DOMAIN-NAME/httpdocs/include/[login to view URL](39): ADONewConnection('mysqli') #1 /var/www/vhosts/DOMAIN-NAME/httpdocs/[login to view URL](3): include('/var/www/vhosts...') #2 {main} thrown in /var/www/vhosts/DOMAIN-NAME/httpdocs/include/adodb/[login to view URL] on line 496 I would ideally like someone to send/receive the files and sort out the small issue.