Get Windows 10” Upgrade App Icon is Missing in Taskbar

METHOD 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\UpgradeExperienceIndicators

And in right-side pane, make sure values of UpgEx and UpgExU are set to Green. If their values are different, change them to Green.

Also make sure Genuine string is set to 1.

If you can't find above mentioned values in "UpgradeExperienceIndicators" key, you'll need to create them manually. You can match values of all available strings with following screenshot:

NOTE 2: If you see another key with the name REDUCED under UpgradeExperienceIndicatorskey, it means the "Get Windows 10" app is running under reduced mode. It happens when your computer hardware is not compatible with Windows 10 upgrade. In such case, as mentioned inpoint 4 of "Important Things to Know" above, the app icon in system tray will automatically appear after Windows 10 launch date i.e. July 29, 2015. So you should wait of Windows 10 

METHOD 2:

If the upgrade app has been installed in your computer, you can try to manually run the app by going to "C:\Windows\System32\GWX" folder and run GWX.exe file.

It'll add the icon to Taskbar and then you can access the app by clicking on the icon.

NOTE: If you still don't see the icon in Taskbar, open Command Prompt as Administrator and run following commands one by one:

C:\Windows\System32\GWX\GWXConfigManager.exe /RefreshConfig
C:\Windows\System32\GWX\GWX.exe /taskLaunch

Now the icon should be visible in Taskbar notification area.