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Windows 10 Advertising SDK Walkthrough article states that “it is highly recommended that you uninstall all prior instances of the Advertising SDK”. I am not sure that the article is relevant, because it mentions some preview version of SDK, but never too much of a good thing, so I decided to get rid of Advertising SDK for Windows 8.1 that is listed in VS2015 extensions along with the new SDK:

For some reason Advertising SDK is not found in Apps & features:

So after doing some internet search I found a way how to uninstall it using PowerShall, below I briefly described steps I did:

Run PowerShall as administrator:

listed all the Microsoft Advertising components:

gwmi Win32_Product -Filter "Name LIKE 'Microsoft Advertising%'"

IdentifyingNumber : {6AB13C21-C3EC-46E1-8009-6FD5EBEE515B}
Name              : Microsoft Advertising SDK for Windows 8.1 – ENU
Vendor            : Microsoft Corporation
Version           : 8.1.30809.0
Caption           : Microsoft Advertising SDK for Windows 8.1 – ENU

IdentifyingNumber : {6AC81125-8485-463D-9352-3F35A2508C11}
Name              : Microsoft Advertising SDK for Windows Phone 8.1 XAML – ENU
Vendor            : Microsoft Corporation
Version           : 8.1.40427.0
Caption           : Microsoft Advertising SDK for Windows Phone 8.1 XAML – ENU

IdentifyingNumber : {5C87A4DB-31C7-465E-9356-71B485B69EC8}
Name              : Microsoft Advertising SDK for Windows Phone – ENU
Vendor            : Microsoft Corporation
Version           : 6.2.960.0
Caption           : Microsoft Advertising SDK for Windows Phone – ENU

IdentifyingNumber : {EBD9DB6D-180B-4C59-9622-B75CC4B32C94}
Name              : Microsoft Advertising Service Extension for Visual Studio
Vendor            : Microsoft Corporation
Version           : 12.0.40402.0
Caption           : Microsoft Advertising Service Extension for Visual Studio

uninstalled them:

gwmi Win32_Product -Filter "Name LIKE 'Microsoft Advertising%'" | foreach { $_.Uninstall() }

__GENUS          : 2
__CLASS          : __PARAMETERS
__SUPERCLASS     :
__DYNASTY        : __PARAMETERS
__RELPATH        :
__PROPERTY_COUNT : 1
__DERIVATION     : {}
__SERVER         :
__NAMESPACE      :
__PATH           :
ReturnValue      : 0
PSComputerName   :

__GENUS          : 2
__CLASS          : __PARAMETERS
__SUPERCLASS     :
__DYNASTY        : __PARAMETERS
__RELPATH        :
__PROPERTY_COUNT : 1
__DERIVATION     : {}
__SERVER         :
__NAMESPACE      :
__PATH           :
ReturnValue      : 0
PSComputerName   :

__GENUS          : 2
__CLASS          : __PARAMETERS
__SUPERCLASS     :
__DYNASTY        : __PARAMETERS
__RELPATH        :
__PROPERTY_COUNT : 1
__DERIVATION     : {}
__SERVER         :
__NAMESPACE      :
__PATH           :
ReturnValue      : 0
PSComputerName   :

__GENUS          : 2
__CLASS          : __PARAMETERS
__SUPERCLASS     :
__DYNASTY        : __PARAMETERS
__RELPATH        :
__PROPERTY_COUNT : 1
__DERIVATION     : {}
__SERVER         :
__NAMESPACE      :
__PATH           :
ReturnValue      : 0
PSComputerName   :

A zero ReturnValue here indicates that uninstall was complete successfully, so do not have old SDK listed in VS2015 anymore: