Changing the IIS Version Number

Sometimes when installing new modules into IIS (7.5 in this case) they are not "supported" for this version of IIS but you need to install them anyway. You also don't necessarily have an alternative to you just need to go with it :) .

Here is a quick fix to get past the version check validation some modules when installed them. Modules such as Media Services 4.1

Briefly decrease the registry value of IIS in the registry:

1. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\InetStp\MajorString
2. Change the value to whatever is required. In my case this was anything below version 9.
3. Install the module.
4. Ensure all is working as expected.
5. Revert your changes to the MajorString value at the same registry key as described in step 1.