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If you reach out to your SE they'll be able to grab it from the internal repository, super common ask. Support would probably be hesitant but if you tell them it's specifically to upgrade a customer they'll probably do it as well, though they may need to get approval.

And if you want them from a trustworthy external source, I have quite a lot of them as well which I can share. That is, if you can consider me trustworthy 😁

I would consider you trustworthy 😉 I got myself out of the bind by logging in to all of my customers and grabbing every single downloaded nCore file I neglected to clean up after upgrading. So now I keep an archive of those on my OneDrive. Stupid it has to come to this, but here we are.