Unable to reference Windows IoT in Visual Studio 2017

Question

When I upgraded Visual Studio 2017 to 15.8.2 it crashed and I had to wipe everything and reload. Since then I have not been able to get the Windows IoT Extensions for the UWP. When I click on the reference in my project the Windows IoT Extension shows up with a yellow triangle. I right click on reference to add reference, go to universal windows (it shows core and extensions), I click extensions and Windows IoT is not there. I've uninstalled and installed VS2017 many times and I think I'm following the IoT instructions to the letter on the install but obviously I'm being thick and missing something. Any help would be greatly appreciated.

<?xml version="1.0" encoding="utf-8"?>
<Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" xmlns:iot="http://schemas.microsoft.com/appx/manifest/iot/windows10" IgnorableNamespaces="uap mp iot">
  <Identity Name="3ac96fd1-69de-454f-a811-1b1ac668e762" Publisher="CN=kbown" Version="1.0.0.0" />
  <mp:PhoneIdentity PhoneProductId="3ac96fd1-69de-454f-a811-1b1ac668e762" PhonePublisherId="00000000-0000-0000-0000-000000000000" />
  <Properties>
    <DisplayName>Water_Dewater</DisplayName>
    <PublisherDisplayName>kbown</PublisherDisplayName>
    <Logo>Assets\StoreLogo.png</Logo>
  </Properties>
  <Dependencies>
    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.0.0" MaxVersionTested="10.0.0.0" />
  </Dependencies>
  <Resources>
    <Resource Language="x-generate" />
  </Resources>
  <Applications>
    <Application Id="App" Executable="$targetnametoken$.exe"          EntryPoint="Water_Dewater.App">
      <uap:VisualElements DisplayName="Water_Dewater" Square150x150Logo="Assets\Square150x150Logo.png" Square44x44Logo="Assets\Square44x44Logo.png" Description="Water_Dewater" BackgroundColor="transparent">
        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png">
        </uap:DefaultTile>
        <uap:SplashScreen Image="Assets\SplashScreen.png" />
      </uap:VisualElements>
    </Application>
  </Applications>
  <Capabilities>
    <Capability Name="internetClient" />
    <iot:Capability Name="lowLevelDevices" />
    <iot:Capability Name="systemManagement" />
    <DeviceCapability Name="109b86ad-f53d-4b76-aa5f-821e2ddf2141" />
  </Capabilities>
</Package>

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Answer 1

The Windows IoT Extensions for the UWP will be installed on the following path via Windows Software Development Kit(SDK) .

After installation complete, you can check in control panel.

You can try to install SDK to see if it helps.

Update: