> The rest are available at <https://developer.apple.com/download/more/>.

That link contains old versions of Xcode for me, but not old operating systems. 
I wonder, Joshua, do you have  a paid Apple developer account? (I do not.)

> And half the time, when I try to create a new VM using an old version's 
> installer, the installer process tells me "This installer has been damaged" 
> and refuses to continue.

Depending on the version of macOS, you may be able to silence that by popping 
into the Terminal. 
https://apple.stackexchange.com/questions/216730/this-copy-of-the-install-os-x-el-capitan-application-cant-be-verified-it-may-h/232016#232016

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