I am trying to migrate this plugin to version 2.70 and when i am compilling i got those error messages

Error  16  'Nop.Core.Domain.Discounts.DiscountRequirement' does not contain a definition for 'SpentAmount'  d:\nopecommerce\version2.70\Plugins\Nop.Plugin.DiscountRules.OrderTotal\Controllers\DiscountRulesOrderTotal.cs  73  21  Nop.Plugin.DiscountRules.OrderTotal

Error  13  'Nop.Core.Domain.Discounts.DiscountRequirement' does not contain a definition for 'SpentAmount' and no extension method 'SpentAmount' accepting a first argument of type 'Nop.Core.Domain.Discounts.DiscountRequirement' could be found (are you missing a using directive or an assembly reference?)  D:\USNAUTIC\nopecommerce\version2.65\octobre\Plugins\Nop.Plugin.DiscountRules.OrderTotal\OrderTotalDiscountRequirementRule.cs  144  62  Nop.Plugin.DiscountRules.OrderTotal


Error  12  The call is ambiguous between the following methods or properties: 'Nop.Core.Domain.Customers.CustomerExtentions.IsGuest(Nop.Core.Domain.Customers.Customer, bool)' and 'Nop.Services.Customers.CustomerExtentions.IsGuest(Nop.Core.Domain.Customers.Customer, bool)'  D:\USNAUTIC\nopecommerce\version2.65\octobre\Plugins\Nop.Plugin.DiscountRules.OrderTotal\OrderTotalDiscountRequirementRule.cs  141  45  Nop.Plugin.DiscountRules.OrderTotal


I tried to locate the SpeentAmount without any success. I need this plugin for my store badly ...

Anyone can help please

Best Regards

Yves