I am afraid all the ADDONS are still 32bit.
But a 32bit MySQL should not have caused the Apache service to fail to start ( as your error message implies )
When you download a new MySQL that new version is completely seperate from the original one and is as if fresh out of the box. So you have a 'root' userid with no password which is the SuperUser, allowed to do anything. Login using Username = root password = (leave it blanks )
Suggest you install the 32bit WAMPServer and go from there.
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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-