In this case, you should leave the installation part. If you’re prompted to insert an Omnisphere disc then you have to follow the below method.Use the same path (“C: \ VstPlugins \ Omnisphere 2”) for the installation of the Vst plugin in the Steam folder.Go to the installation path that will look like “C: \ VstPlugins \ Omnisphere 2” to install the Vst plugin.