User327754 postedHi,
First of all install these packages that show in blow image. Android SDK Tools 26.1.1 and Android Emulator 27.0.2

After this installation click on Android Emulator Manager it hits a dialog box that update your Emulator Manager to newer version like shown in blow image.

Click on NEW and choose android version select 8.0 Oreo and any device theme. Emulator manager will download online image of android system after downloading complete click on create button. Enjoy new version of Emulator.