If you are getting an error "The property 'Value' cannot be found on this object. Verify that the property exists" then basically what it's saying is that you have stopped your IIS and Sitecore 9.3 installation wizard is unable to start your IIS instance for the Sitecore Identity server so it can complete the installation.
So open your Command Prompt as an Administration reset your IIS using the command below:
iisreset
[---------- IdentityServer_StopWebsite : ManageWebsite -----------------------]
[IdentityServer_StopWebsite]:[Stop] identity.your.server.com
The property 'Value' cannot be found on this object. Verify that the property exists.
[TIME] 00:00:13
The property 'Value' cannot be found on this object. Verify that the property exists.