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: