Hi @Loveyou3000 ,
As you said, IIS is a great choice for asp.net, compared with other non-microsoft production.
The biggest difference between IIS versions is IIS6 and IIS7. There is no big difference between the versions after IIS7, only some functions are improved and added, such as HTTP/2, FTP, Logging Enhancements......Whatever IIS8 or IIS10, both of them are great test platform for developers.
If it is not the newest IIS, how can I get the newest version.
IIS depends on the windows system. It is not support updating by installing patches or downloading installation packages. The newest IIS is IIS10, if you want to get IIS10, please update windows OS to windows 10.
If you want to deploy application to windows server, windows server 2019 is more recommended. It is the newest windows server and more security.
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Best regards,
Bruce Zhang