Hi,
> I thought I had database backup, but I can't find
It is a file with .sql extension.
You have to launch the old version of Wampserver to export your database in SQL file.
But, to launch the old version and avoid conflicts, you must first remove the services via a command window :
sc delete wampapache
sc delete wampmysqld
sc delete wampmariadb
sc delete wampapache64
sc delete wampmysqld64
sc delete wampmariadb64
Once the old version is launched, you need to create services through the Left-Click menu of wampmanager:
Left-click -> Apache -> Service management -> Install service
Same thing for MySQL and MariaDB
Left-click -> Start services
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons