3
           
            
                
     
    
    Unfortunately it looks like Mamba forgot to rewrite part of the install function in the ./include/oninstall.php file. You might try replacing lines 41-64 (the xoops_module_pre_install_wfdownloads function) with:
 function xoops_module_pre_install_wfdownloads(XoopsModule $module) 
{ 
    include __DIR__ . '/common.php'; 
    /** @var XoopsModulesWfdownloadsUtility $utility */ 
    $utility = new XoopsModulesWfdownloadsUtility(); 
    //check for minimum XOOPS version 
    $xoopsSuccess = $utility::checkVerXoops($module); 
    // check for minimum PHP version 
    $phpSuccess   = $utility::checkVerPhp($module); 
    if (false !== $xoopsSuccess && false !==  $phpSuccess) { 
        $moduleTables =& $module->getInfo('tables'); 
        foreach ($moduleTables as $table) { 
            $GLOBALS['xoopsDB']->queryF('DROP TABLE IF EXISTS ' . $GLOBALS['xoopsDB']->prefix($table) . ';'); 
        } 
    } 
    return $xoopsSuccess && $phpSuccess; 
}  
That should at least get you past the pre-install check for PHP and XOOPs versions.