Getting error while upgrading to version 4.40

1. Severity  Code  Description  Project  File  Line  Suppression State
Error  CS0535  'EntityRepository<TEntity>' does not implement interface member 'IRepository<TEntity>.TableNoTracking'  Nop.Data


2. Severity  Code  Description  Project  File  Line  Suppression State
Error  CS0535  'DistributedCacheManager' does not implement interface member 'IStaticCacheManager.Get(string, Func<IEnumerable<string>>)'  Nop.Core  

3.Severity  Code  Description  Project  File  Line  Suppression State
Error  CS0535  'MemoryCacheManager' does not implement interface member 'IStaticCacheManager.Get(string, Func<IEnumerable<string>>)'  Nop.Core  

4. Severity  Code  Description  Project  File  Line  Suppression State
Error  CS0535  'StoreMappingService' does not implement interface member 'IStoreMappingService.Authorize(Product)'  Nop.Services

RE: "...does not implement interface member..."
How are you doing the "upgrade"?  You should download the entire source code version and build it as is.  Then, if you need to, merge in any custom code.