Gacutil.exe (Global Assembly Cache Tool)

1. Open CMD as administrator.
2. Type the following:
   gacutil /i path_to_assembly_file /f
   For example, type:
   C:\Windows\system32>gacutil /i "D:\bkp\Project\Code xxxx\XXXXX\XXXXXX
   \bin\Release\xxxxx.dll"
   Microsoft (R) .NET Global Assembly Cache Utility.  Version 4.0.30319.33440
   Copyright (c) Microsoft Corporation.  All rights reserved.
   
   
   Assembly successfully added to the cache