Hi
Remember WAMPServer can have multiple versions fo MySQL installed and you an switch between them.
All you need to do with WAMPServer 3+ is download a MySQL ADDON for the original version of MySQL, then you can replace he files as you say you are currently trying to do.
Once they are moved into the original MySQL version folder, switch to the old MySQL do a backup, then switch to the new version of MySQL and restore.
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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>Read The Manuals Apache --
MySQL --
PHP --
phpMyAdminGet your Apache/MySQL/mariaDB/PHP ADDONs here from the
WAMPServer alternate Repo-X-X-X-
Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-