Hi,
> My installation is 64bit on windows 10, in the folder C:\wamp64
> During installation, i choose the same folder of wampserver 3.0 "C:\wamp64" or default folder C:\wamp?
This is an update, which implies that there is already a version of Wampserver... so you have to use the folder where your version of Wampserver is installed, so c:\wamp64.
From version 3.0.4 onwards, updates and addons can find the folder where Wampserver is installed on their own.
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons