Have you tried Electrum[1]? It's a lightweight wallet that doesn't require you to download the whole blockchain. Just select "Legacy" as wallet type when creating a new wallet. Since it's only for a quick test, it should be enough.

Or if you still want to use Bitcoin Core, you can generate a single legacy address by opening the console (Windows -> Console) and using the following command:

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[1] https://electrum.org/#download (the ONLY legit website to download Electrum's wallet. Please double check the URL and verify the file signature if you decide to use it).