Hi,
Just because it says 2.5 doesn't mean it only applies to version 2.5.
By reading the procedure carefully, you can understand that it can even apply to a server other than Wampserver.
You say you have found an update 2.4 to 2.5, but I don't know the reliability of it at all.
The most reliable and durable way for both your local sites and databases is to apply the procedure explained in:
Install a new release of Wampserver---------------------------------------------------------------
Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons