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I hope someone can help. Not sure if there is a way to download them after the signup process has been completed. I tested it before and couldn't find any.

@tsunsica or @khaleelkazi can probably help

If you have saved those 12 words ( in a right order) - you are safe.

If not - you are screwed.
Time to start again, & everything from scratch

If you have the seed phrase you can use the recover option to get the keystore file back.

And you can have the Hive Keys by using the seed phrase to enter your account in the Hive Keychain which you can use as a mobile app or a browser extension