Is installing the older Windows 10 version to the C:\ Drive?

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I've decided to do a install of the older Windows 10 build because of noticing of bugs. How? I went to the older Windows 10 setup.exe file.

But i don't know if this is installing into the C:\ Drive because of this:



I have 3 partitions:

1. Built In System Drive (C:\)
   
2. Local Disk (D:\)
3. Win10 Recovery (E:\)

However it says:

You can't keep Windows settings, personal files, and apps because your current version of Windows might be installed in an unsupported directory.


I don't know if it installs to the C:\ Drive!


What this means? Please help!

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