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Hello, @sonofsha
Perhaps you mean version 6.5 and not 6.15.
Do you have PHP logs? You can also download the previous version here: https://cleantalk.org/help/install-wordpress
But, we want to resolve this issue. Can you reach out to our support team so we can gather some more information from you concerning this issue? Please, create a private ticket:
Please, paste the link to this topic, so we can identify you quickly.