JQuery Menu Plugin

Hi all, looking for someone who may be able to help debug this error from the Jquery Menu v 10.0 plugin that only occurs with osclass version 5.1.2 and not 8.0.2. 

Running both osclass versions on my local server with Wamp - Php 7.2.4, mysql 5.7.21, apache 2.4.33

Using same theme (one I purchased a while ago) on both versions of osclass successfully so that can't be the issue as the plugin works on one version of osclass (8.0.2) but not the other.

Tried with the default theme and still get the same error.

I am assuming it has something to do with the oclass core in 5.1.2 but having troubles locating possible source. 

Googled the function but not finding any answers I understand there either.

Any help greatly appreciated.

Error:

 Fatal error: Uncaught Error: Call to undefined function getConnection() in C:\wamp\www\website\oc-content\plugins\jquery_menu\index.php on line 13

( ! ) Error: Call to undefined function getConnection() in C:\wamp\www\website\oc-content\plugins\jquery_menu\index.php on line 13

Call Stack

#  Time      Memory    Function      Location

1  0.0007   389240   {main}( )      ...\index.php:0

2  0.3421  1246448   CAdminPlugins->doModel( )   ...\index.php:95

3  0.3472  1249632  Plugins::install( )   ...\CAdminPlugins.php:292

4  0.34761250168   Plugins::runHook( )  ...\Plugins.php:375

5  0.34761250216   jMenu_call_after_install( )  ...\Plugins.php:410

Here is the code line referrenced in index.php as per the error:

function jMenu_call_after_install() {
  $conn = getConnection() ;
  $path = osc_plugin_resource('jquery_menu/struct.sql') ;
  $sql  = file_get_contents($path) ;
  $conn->osc_dbImportSQL($sql) ;
  $conn = getConnection();
  $conn->autocommit(false);
  try {
    $conn->commit();
    osc_set_preference('parent-selectable', '1', 'plugin-jMenu', 'INTEGER');
    osc_set_preference('show-arrow', '1', 'plugin-jMenu', 'INTEGER');
    osc_set_preference('show-ad-count', '1', 'plugin-jMenu', 'INTEGER');
  } catch (Exception $e) {
    $conn->rollback();
    echo $e->getMessage();
  }