I would only add, upgrading to any new vB version can be very hard, depending on how customized installation is. It can be a task to admire even for more seasoned admins, let alone rookie ones.
But, you can try to contact support and explain situation, provide evidences you have and they might give you access, you never know.
And, before you try to do upgrade, do it on test site, to see what's going on, never try to do update on live site before test run.
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