Hi abdu bukres,
Our documentation is currently available only when your Visual Studio integrated help system is configured to use local help rather than online help.
You can switch the documentation to a local help by following the steps below
1. Choose Help -> Manage Help Settings from within Visual Studio
2. Click the "Choose online or local help" link
3. Set your preference to "I want to use local help" and click OK
4. Try loading the documentation
i hope it will works...!