I dont think that superuser post is relevant.
If you are going to mess with your live site by copying database tables into it, it is at your own risk. These files would not MERGE with existsing tables they would over write existing tables.
Assuming you have a full set of mysql tables the process of getting them back on your laptop would be:
1. Make sure the existing stuff is safe. i.e. whatever is left of your old wamp folder.
2. Uninstall the WAMPServer you installed and nuked
3. makes sure the \wamp folder is removed
4. Install WAMPServer
5. Make sure WAMPServer runs.
6. Copy the old MYSQL folder \oldwamp\bin\mysql\mysql5.6.12 to \wamp\bin\mysql\mysql5.6.12
7. Stop and restart WAMPServer
8. look for the old MYSQL wampmanager->MYSQL->mysql5.6.12 to make sure it is being seen by WAMPServer
9. Switch to the old MYSQL version wampmanager->MYSQL->Version->Mysql5.6.12 (click on version number)
10. Leave it at that so 5.6.12 is the active MYSQL version
11. Copy oldwamp\www\wordpress to wamp\www\wordpress (or whatever the folder is called)
12. Restart WAMPServer
13. Attempt to run you wordpress local site
All the problems you had were I believe related to your attempt to copy bits of MYSQL files from one version to another. Sometimes that may work, but only if/when you know what you are doing, and if the versions are compatible, and if all tables are MYISAM.
There are folders in \wamp\bin\mysql\mysql{version} that should not be copied between version as they are almost guaranteed to be incompatible
If you want help with this process, or with checking that you in fact have all the files that constitute your old database in the first place, my offer of Team Viewer is still open
---------------------------------------------------------------------------------------------
(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-