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Do not put the old files in the new Presta. You will do even more damage.
Is your e-shop alive? Wouldn't you rather hire someone experienced to do the repair?
It is necessary to realize that if the upgrade had an error and you did not make a FTP and database backup, it is a big problem (everything points to it). The programmer will adjust everything for you and quickly. You will be looking for several days of advice that will not help you and you will lose profit and many hours spent on repairs.