How can I tell what version of IIS is installed?

As a more general answer, not specifically aimed at your question, Microsoft has a support article which lists all old versions and the operating systems that provide each one.

IIS version   Built-in  
5.0           Windows 2000
5.1           Windows XP Pro
6.0           Windows Server 2003
7.0           Windows Vista and Windows Server 2008
7.5           Windows 7 and Windows Server 2008 R2
8.0           Windows 8 and Windows Server 2012

Current versions are on Wikipedia

8.5           Windows 8.1 and Windows Server 2012 R2
10.0 v1607    Windows Server 2016 and Windows 10.*
10.0 v1709    Windows Server 2016 v1709 and Windows 10.*
10.0 v1809    Windows Server 2019  and Windows 10.* October

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